openstack-packstack: Race condition caused /etc/sysconfig/modules/kvm.modules could not be found.

Description:
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When attempted to install environment on  3 physical machines, 1 controller and 2 compute-nodes (using: openstack-packstack-2012.2.2-0.1.dev337.el6.noarch) installation failed with the following error : "/bin/sh: /etc/sysconfig/modules/kvm.modules: No such file or directory"


After investigation, it seems that the execution of : https://github.com/stackforge/packstack/blob/folsom/packstack/puppet/templates/nova_compute.pp#L39
Is depends on 'nova::compute::libvirt' and not on 'nova::compute',  /etc/sysconfig/modules/kvm.modules wasn't installed yet.


Installation trace:
*******************
Testing if puppet apply is finished : 10.35.160.13_nova.pp
Testing if puppet apply is finished : 10.35.160.13_nova.pp
Testing if puppet apply is finished : 10.35.160.13_nova.pp
Testing if puppet apply is finished : 10.35.160.13_nova.pp
Testing if puppet apply is finished : 10.35.160.13_nova.pp
Testing if puppet apply is finished : 10.35.160.13_nova.pp
Testing if puppet apply is finished : 10.35.160.13_nova.pp
Testing if puppet apply is finished : 10.35.160.13_nova.pp
ERROR:root:Error  during remote puppet apply of /var/tmp/packstack/20130129-1212/manifests/10.35.160.13_nova.pp
ERROR:root:warning: You cannot collect exported resources without storeconfigs being set; the collection will be ignored on line 142 in file /var/tmp/packstack/20130129-1212/modules/nova/manifests/init.pp                                                                                                                                        
warning: You cannot collect exported resources without storeconfigs being set; the collection will be ignored on line 152 in file /var/tmp/packstack/20130129-1212/modules/nova/manifests/init.pp                                                                                                                                                   
warning: You cannot collect exported resources without storeconfigs being set; the collection will be ignored on line 161 in file /var/tmp/packstack/20130129-1212/modules/nova/manifests/init.pp                                                                                                                                                   
warning: You cannot collect exported resources without storeconfigs being set; the collection will be ignored on line 21 in file /var/tmp/packstack/20130129-1212/modules/nova/manifests/compute.pp                                                                                                                                                 
notice: /Stage[main]/Nova::Compute::Libvirt/Package[libvirt]/ensure: created
notice: /Stage[main]/Nova::Compute::Libvirt/Service[libvirt]/ensure: ensure changed 'stopped' to 'running'
notice: /Stage[main]//Package[python-cinderclient]/ensure: created
notice: /Stage[main]/Mysql::Python/Package[python-mysqldb]/ensure: created
notice: /Stage[main]/Nova/Package[python-greenlet]/ensure: created
notice: /Stage[main]/Nova/Package[python-nova]/ensure: created
notice: /Stage[main]/Nova/Package[nova-common]/ensure: created
notice: /Stage[main]/Nova/Nova_config[state_path]/ensure: created
notice: /Stage[main]/Nova/Nova_config[rabbit_port]/ensure: created
notice: /Stage[main]//Nova_config[rpc_backend]/ensure: created
notice: /Stage[main]/Nova/Nova_config[rabbit_password]/ensure: created
notice: /Stage[main]/Nova::Compute::Libvirt/Nova_config[vncserver_listen]/ensure: created
notice: /Stage[main]//Nova_config[libvirt_inject_partition]/ensure: created
notice: /Stage[main]//Nova_config[volume_api_class]/ensure: created
notice: /Stage[main]//Nova_config[flat_interface]/ensure: created
notice: /Stage[main]/Nova/Nova_config[glance_api_servers]/ensure: created
notice: /Stage[main]/Nova/Nova_config[verbose]/ensure: created
notice: /Stage[main]/Nova/Nova_config[rootwrap_config]/ensure: created
notice: /Stage[main]//Nova_config[metadata_host]/ensure: created
notice: /Stage[main]/Nova::Compute/Nova_config[vncserver_proxyclient_address]/ensure: created
notice: /Stage[main]/Nova::Compute::Libvirt/Nova_config[compute_driver]/ensure: created
notice: /Stage[main]//Nova_config[network_host]/ensure: created
notice: /Stage[main]//Nova_config[qpid_hostname]/ensure: created
notice: /Stage[main]/Nova::Compute/Nova_config[novncproxy_base_url]/ensure: created
notice: /Stage[main]/Nova/Nova_config[logdir]/ensure: created
notice: /Stage[main]/Nova/Nova_config[sql_connection]/ensure: created
notice: /Stage[main]/Nova/Nova_config[service_down_time]/ensure: created
notice: /Stage[main]/Nova::Compute::Libvirt/Nova_config[connection_type]/ensure: created
notice: /Stage[main]/Nova::Compute::Libvirt/Nova_config[libvirt_type]/ensure: created
err: /Stage[main]//Exec[load_kvm]/returns: change from notrun to 0 failed: /bin/sh: /etc/sysconfig/modules/kvm.modules: No such file or directory
                                                                                                                                                                          
notice: /Stage[main]/Nova/Nova_config[rabbit_userid]/ensure: created
notice: /Stage[main]/Nova/Nova_config[rabbit_host]/ensure: created
notice: /Stage[main]/Nova::Compute/Nova_config[vnc_enabled]/ensure: created
notice: /Stage[main]/Nova/Nova_config[lock_path]/ensure: created
notice: /Stage[main]/Nova/Nova_config[auth_strategy]/ensure: created
notice: /Stage[main]/Nova/Nova_config[rabbit_virtual_host]/ensure: created
notice: /Stage[main]/Nova/Nova_config[image_service]/ensure: created
notice: /Stage[main]/Nova/Exec[post-nova_config]: Triggered 'refresh' from 29 events
notice: /File[/etc/nova/nova.conf]/owner: owner changed 'root' to 'nova'
notice: /File[/var/log/nova]/group: group changed 'root' to 'nova'
notice: /File[/var/log/nova]/mode: mode changed '755' to '751'
notice: /Stage[main]/Nova::Compute/Nova::Generic_service[compute]/Package[nova-compute]/ensure: created
notice: /Stage[main]/Nova::Compute/Nova::Generic_service[compute]/Service[nova-compute]/ensure: ensure changed 'stopped' to 'running'
notice: /Stage[main]/Nova::Compute/Nova::Generic_service[compute]/Service[nova-compute]: Triggered 'refresh' from 2 events
notice: /Firewall[001 nove compute incoming]/ensure: created
notice: Finished catalog run in 243.48 seconds

Testing if puppet apply is finished : 10.35.160.13_nova.pp                          [ ERROR ]
ERROR:root:Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/packstack/installer/run_setup.py", line 806, in main
    _main(confFile)
  File "/usr/lib/python2.6/site-packages/packstack/installer/run_setup.py", line 593, in _main
    runSequences()
  File "/usr/lib/python2.6/site-packages/packstack/installer/run_setup.py", line 569, in runSequences
    controller.runAllSequences()
  File "/usr/lib/python2.6/site-packages/packstack/installer/setup_controller.py", line 57, in runAllSequences
    sequence.run()
  File "/usr/lib/python2.6/site-packages/packstack/installer/setup_sequences.py", line 154, in run
    step.run()
  File "/usr/lib/python2.6/site-packages/packstack/installer/setup_sequences.py", line 60, in run
    function()
  File "/usr/lib/python2.6/site-packages/packstack/plugins/puppet_950.py", line 123, in applyPuppetManifest
    waitforpuppet(currently_running)
  File "/usr/lib/python2.6/site-packages/packstack/plugins/puppet_950.py", line 111, in waitforpuppet
    validate_puppet_logfile(log)
  File "/usr/lib/python2.6/site-packages/packstack/modules/ospluginutils.py", line 134, in validate_puppet_logfile
    raise PackStackError(message)
PackStackError: Error during puppet run : err: /Stage[main]//Exec[load_kvm]/returns: change from notrun to 0 failed: /bin/sh: /etc/sysconfig/modules/kvm.modules: No such file or directory

Error during puppet run : err: /Stage[main]//Exec[load_kvm]/returns: change from notrun to 0 failed: /bin/sh: /etc/sysconfig/modules/kvm.modules: No such file or directory
Please check log file /var/tmp/packstack/20130129-1212/openstack-setup.log for more information