koan should wait for a VM to be in VIR_DOMAIN_SHUTOFF state before recreating the domain

[pieterlauwers]

When the VM is halted at the end of the installation, koan can restart the VM.
In this case, koan waits until the vm is shutdown and then performs a virsh create for the VM.

I noticed in several occasions that the creation failed with error
`

• polling for virt completion
• install is still running, sleeping for 1 minute (0)
• install is still running, sleeping for 1 minute (1)
• install is still running, sleeping for 1 minute (2)
• install is still running, sleeping for 1 minute (3)
• install is still running, sleeping for 1 minute (4)
• shutdown VM detected, is the install done? Restarting!
  <class 'libvirt.libvirtError'>
  Requested operation is not valid: domain is already running
  File "/usr/lib/python2.6/site-packages/koan/app.py", line 274, in main
  k.run()
  File "/usr/lib/python2.6/site-packages/koan/app.py", line 424, in run
  self.virt()
  File "/usr/lib/python2.6/site-packages/koan/app.py", line 844, in virt
  return self.net_install(after_download)
  File "/usr/lib/python2.6/site-packages/koan/app.py", line 671, in net_install
  after_download(self, profile_data)
  File "/usr/lib/python2.6/site-packages/koan/app.py", line 842, in after_download
  self.virt_net_install(profile_data)
  File "/usr/lib/python2.6/site-packages/koan/app.py", line 1562, 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)
  `

i think this is caused by the status polling that interprets the domain status VIR_DOMAIN_SHUTDOWN the same as VIR_DOMAIN_SHUTOFF. But VIR_DOMAIN_SHUTDOWN means

the domain is being shut down

And in this state the VM can't be recreated (yet).
This error happens only now and again because the VIR_DOMAIN_SHUTDOWN state is short lived (less than a second in my tests) and the polling interval is 60 seconds.

CentOS release 6.9 (Final)
koan-2.6.11-1.el6.noarch
libvirt-0.10.2-62.el6.x86_64