Description of problem:
During installation of OpenStack with packstack, nova-compute process can die sometimes(!) because of socket connection to libvirt is broken, while libvirt is getting restarted, and at the end, after packstack run ends "successfully" nova-compute service is dead.
This was spotted only in with-qpid installations, though does not have to be limited only to qpid.

Version-Release number of selected component (if applicable):
> openstack-nova-compute.noarch                     2014.1-7.el7ost
> libvirt-daemon.x86_64 (and other libvirt-* pkgs)  1.1.1-29.el7
> python-nova.noarch                                2014.1-7.el7ost            
> python-novaclient.noarch                          1:2.17.0-2.el7ost
> openstack-packstack.noarch (and ..-puppet)        2014.1.1-0.28.dev1194.el7ost
> openstack-puppet-modules.noarch                   2014.1-18.el7ost
> python-qpid.noarch                                0.18-12.el7
> qpid-cpp-client.x86_64                            0.18-25.el7
> qpid-cpp-server.x86_64                            0.18-25.el7

Steps to Reproduce:
1. just try installing with install with packstack (answerfile provided, +qpid?) few times (not rerun on same machine)
2. after packstack ends check status of service (service/systemctl/..., for ex. openstack-status shows 'inactive' but without "disabled on boot")

Actual results:
openstack-nova-compute service is dead
nova-compute.log contains
2014-06-30 06:17:02.716 11723 ERROR nova.openstack.common.threadgroup [-] Connection to the hypervisor is broken on host: jenkins-298aae9c-112.novalocal

Expected results:
nova-compute is running and working

Additional info:
in /var/log/messages following appears:

> Jun 30 06:17:02 jenkins-298aae9c-112 systemd: Stopping Virtualization daemon...           
> Jun 30 06:17:02 jenkins-298aae9c-112 systemd: Starting Virtualization daemon...           
> Jun 30 06:17:02 jenkins-298aae9c-112 nova-compute: libvirt: XML-RPC error : Failed to connect socket to '/var/run/libvirt/libvirt-sock': No such file or directory
> Jun 30 06:17:02 jenkins-298aae9c-112 nova-compute: Traceback (most recent call last):     
> Jun 30 06:17:02 jenkins-298aae9c-112 nova-compute: File "/usr/lib/python2.7/site-packages/eventlet/hubs/poll.py", line 97, in wait

timing matches packstack run (/var/tmp/packstack/*/openstack-setup.log):
> 2014-06-30 06:10:57::DEBUG::run_setup::409::root:: no post condition check for group PUPPET
> 2014-06-30 06:10:57::DEBUG::run_setup::596::root:: {'CONFIG_RH_USER': '', 'CONFIG_REPO': '', 'CONFIG_AMQP_ENABLE_SSL': 'n', 'CONFIG_RH_OPTIONAL': 'y', 'CONFIG_CINDER_KS_PW': '********', 'CONF
> 2014-06-30 06:10:57::DEBUG::sequences::93::root:: Running sequence Clean Up.              
> 2014-06-30 06:10:57::DEBUG::sequences::34::root:: Running step Clean Up.                  
> 2014-06-30 06:10:57::INFO::shell::81::root:: [localhost] Executing script:                
> rm -rf /var/tmp/packstack/20140630-061057-ZBuGR4/manifests/*pp                            
...
> ======== END OF STDOUT ========                                                           
> 2014-06-30 06:21:21::DEBUG::run_setup::575::root:: *** The following params were used as user input:
> 2014-06-30 06:21:21::DEBUG::run_setup::580::root:: ssh-public-key: /root/.ssh/id_rsa.pub  
> 2014-06-30 06:21:21::DEBUG::run_setup::580::root:: mysql-install: y                       
> 2014-06-30 06:21:21::DEBUG::run_setup::580::root:: os-glance-install: y                   
> 2014-06-30 06:21:21::DEBUG::run_setup::580::root:: os-cinder-install: y                   
> 2014-06-30 06:21:21::DEBUG::run_setup::580::root:: os-nova-install: y                     
> 2014-06-30 06:21:21::DEBUG::run_setup::580::root:: os-neutron-install: n                  

While this could be also solved by compute being able to reconnect/survive libvirt restarts (bug #1092820),
packstack or puppets could try to make sure to restart libvirt before nova is started,
or (re)start it after libvirt, or at the end of installation - to not end up with dead service.

Will attach full /var/{log/messages,packstack/*}.