Description of problem:
Rarely spacewalkkoan tries to start guest (on libvirtd, after it finishes installation) although it is running and libvirt returns:

[...]
- install is still running, sleeping for 1 minute (28)
- install is still running, sleeping for 1 minute (29)
- shutdown VM detected, is the install done?  Restarting!
<class 'libvirt.libvirtError'>
Requested operation is not valid: domain is already running
  File "/usr/share/rhn/spacewalkkoan/spacewalkkoan.py", line 251, in initiate_guest
    k.run()
   File "/usr/lib/python2.6/site-packages/koan/app.py", line 377, in run
    self.virt()
   File "/usr/lib/python2.6/site-packages/koan/app.py", line 699, in virt
    return self.net_install(after_download)
   File "/usr/lib/python2.6/site-packages/koan/app.py", line 618, in net_install
    after_download(self, profile_data)
   File "/usr/lib/python2.6/site-packages/koan/app.py", line 697, in after_download
    self.virt_net_install(profile_data)
   File "/usr/lib/python2.6/site-packages/koan/app.py", line 1219, in virt_net_install
    utils.find_vm(conn, virtname).create()
   File "/usr/lib64/python2.6/site-packages/libvirt.py", line 686, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)

D: Sending back response(1, 'Virtual kickstart failed. Koan error.', {'koan': 'Requested operation is not valid: domain is already running   File "/usr/share/rhn/spacewalkkoan/spacewalkkoan.py", line 251, in initiate_guest\n    k.run()\n   File "/usr/lib/python2.6/site-packages/koan/app.py", line 377, in run\n    self.virt()\n   File "/usr/lib/python2.6/site-packages/koan/app.py", line 699, in virt\n    return self.net_install(after_download)\n   File "/usr/lib/python2.6/site-packages/koan/app.py", line 618, in net_install\n    after_download(self, profile_data)\n   File "/usr/lib/python2.6/site-packages/koan/app.py", line 697, in after_download\n    self.virt_net_install(profile_data)\n   File "/usr/lib/python2.6/site-packages/koan/app.py", line 1219, in virt_net_install\n    utils.find_vm(conn, virtname).create()\n   File "/usr/lib64/python2.6/site-packages/libvirt.py", line 686, in create\n    if ret == -1: raise libvirtError (\'virDomainCreate() failed\', dom=self)\n'})
[...]


Version-Release number of selected component (if applicable):
koan-2.0.7-53.el6sat.noarch
spacewalk-koan-2.3.0-2.el6sat.noarch
libvirt-python-0.10.2-54.el6_7.2.x86_64
(running against Satellite 5.7.0 if that is importnat)


How reproducible:
very rarely (seen this kind of error for first time I guess)


Steps to Reproduce:
1. Provision libvirtd guest and watch `rhn_check -vv` output on the virt host


Actual results:
Failure returned by libvirt to Satellite


Expected results:
Should work reliably