Create and redistribute ssh keys for Nova user

The nova non-life migration feature requires to be able
to ssh from nova@ to other nova@ users on other compute nodes.
Setup the ssh keys properly for that.
Increase retries to prevent failure of smoke test.
Merge pull request #241 from waynepallen/pull-req-release-roxy-master-87ff74083456503cbe390e7cf6ef13dba3f0b883

Create and redistribute ssh keys for Nova user [1/1]
Merge pull request #252 from cdearborn/pull-req-release-roxy-master-0a2fad7dc6318c0af6838ed0cffbc26568404d70

Fixed failure in nova smoketests [1/1]