I had a different error but I fixed with the same solution provided in:

https://ask.openstack.org/en/question/35705/attempt-of-rdo-aio-install-icehouse-on-centos-7/

"..replace content /etc/redhat-release with "Fedora release 20 (Heisenbug)" and rerun packstack --allinone. In meantime I have IceHouse AIO Instance on CentOS 7 completely functional."

Terminal:

ERROR : Error appeared during Puppet run: 192.168.11.19_prescript.pp
Error: comparison of String with 7 failed at /var/tmp/packstack/2761ac128766421ab10ff27c754a6285/manifests/192.168.11.19_prescript.pp:15 on node stack1.local.lan
You will find full trace in log /var/tmp/packstack/20140712-012704-8RBDNB/manifests/192.168.11.19_prescript.pp.log
Please check log file /var/tmp/packstack/20140712-012704-8RBDNB/openstack-setup.log for more information


openstack-setup.log:

...
tar --dereference -cpzf - apache ceilometer certmonger cinder concat firewall glance heat horizon inifile keystone memcached mongodb mysql neutron nova nssdb openstack packstack qp
id rabbitmq rsync ssh stdlib swift sysctl tempest vcsrepo vlan vswitch xinetd | ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null root.11.19 tar -C /var/tmp/packstack/2761ac128766421ab10ff27c754a6285/modules -xpzf -
2014-07-12 01:28:57::ERROR::run_setup::920::root:: Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 915, in main
    _main(confFile)
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 605, in _main
    runSequences()
  File "/usr/lib/python2.7/site-packages/packstack/installer/run_setup.py", line 584, in runSequences
    controller.runAllSequences()
  File "/usr/lib/python2.7/site-packages/packstack/installer/setup_controller.py", line 68, in runAllSequences
    sequence.run(config=self.CONF, messages=self.MESSAGES)
  File "/usr/lib/python2.7/site-packages/packstack/installer/core/sequences.py", line 98, in run
    step.run(config=config, messages=messages)
  File "/usr/lib/python2.7/site-packages/packstack/installer/core/sequences.py", line 44, in run
    raise SequenceError(str(ex))
SequenceError: Error appeared during Puppet run: 192.168.11.19_prescript.pp
Error: comparison of String with 7 failed at /var/tmp/packstack/2761ac128766421ab10ff27c754a6285/manifests/192.168.11.19_prescript.pp:15 on node stack1.local.lan
You will find full trace in log /var/tmp/packstack/20140712-012704-8RBDNB/manifests/192.168.11.19_prescript.pp.log

2014-07-12 01:28:57::INFO::shell::81::root:: [192.168.11.19] Executing script:
rm -rf /var/tmp/packstack/2761ac128766421ab10ff27c754a6285
[root@stack1 20140712-012704-8RBDNB]# 


192.168.11.19_prescript.pp.log:

Warning: Config file /etc/puppet/hiera.yaml not found, using Hiera defaults
Error: comparison of String with 7 failed at /var/tmp/packstack/2761ac128766421ab10ff27c754a6285/manifests/192.168.11.19_prescript.pp:15 on node stack1.local.lan
Wrapped exception:
comparison of String with 7 failed
Error: comparison of String with 7 failed at /var/tmp/packstack/2761ac128766421ab10ff27c754a6285/manifests/192.168.11.19_prescript.pp:15 on node stack1.local.lan

I made the following changes to the Puppet scripts, and it worked, although I'm less sure about the need for the .rb
/usr/share/openstack-puppet/modules/nova/manifests/compute/libvirt.pp line 112
<  if($::osfamily == 'RedHat' and $::operatingsystem != 'Fedora') {
>  if($::osfamily == 'RedHat' and $::operatingsystem != 'Fedora' and $::osoperatingsystemmajrelease < 7) {
/usr/share/openstack-puppet/modules/nova/spec/classes/nova_compute_libvirt_spec.rb line 107
<        :operatingsystemrelease => 6.5 }
>        :operatingsystemmajrelease => 6.5 }
/usr/share/openstack-puppet/modules/nova/spec/classes/nova_compute_libvirt_spec.rb line 136
<          super().merge(:operatingsystemrelease => 7.0)
>          super().merge(:operatingsystemmajrelease => 7.0)
/usr/share/openstack-puppet/modules/nova/manifests/params.pp 112
<        'Fedora', 'RedHat': {
<          $special_service_provider = undef
<        }
<        'RedHat': {
<          if ($::operatingsystemrelease < 7) {
>        'Fedora', 'RedHat', 'CentOS': {
>          $special_service_provider = undef
>        }
>        'RedHat', 'CentOS': {
>          if ($::operatingsystemmajrelease < 7) {


Of course, that wasn't the last of the Puppet errors, after fixing the above, I also ran into an Apache problem, which required the following change:
/usr/share/openstack-puppet/modules/apache/manifests/version.pp line 8
<      if ($::operatingsystem == 'Fedora' and $::operatingsystemrelease >= 18) or ($::operatingsystem != 'Fedora' and $::operatingsystemrelease >= 7) {
>      if ($::operatingsystem == 'Fedora' and $::operatingsystemrelease >= 18) or ($::operatingsystem != 'Fedora' and $::operatingsystemmajrelease >= 7) {

*** Bug 1119450 has been marked as a duplicate of this bug. ***

Kashyap - please note the severity here is unspecified. Should be set to something  better.

Created attachment 919050 [details]
RDO AIO CentOS 7 Patch

Apply with:
cd /
patch -p1 < /path/to/packstack.diff

The Fix for this has already been merged in the Nova upstream puppet modules [1].

[1] - https://github.com/stackforge/puppet-nova/commit/0ed5b7745b6b200cdda4ae6b7d88af71498361e4

This bug is coming from the new CentOS versioning number. You will find a full status report on all the fixes for CentOS 7 in https://bugzilla.redhat.com/show_bug.cgi?id=1117035#c4

Updated openstack-puppet-modules has been published to the RDO Icehouse repository.