[openstack-nova/f17] (5 commits) ...Merge branch 'master' into f17

[Pádraig Brady]

Summary of changes:

  165acf4... support non blocking libvirt operations (*)
  a655c41... fix an exception when querying a server through the API (#8 (*)
  f359896... suppress deprecation warnings with db sync at install (#801 (*)
  5689fb3... avoid and cater for missing libvirt instance images (#80179 (*)
  e4573f1... Merge branch 'master' into f17

(*) This commit already existed in another branch; no separate mail sent