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.
Run nova-manage db_sync as the nova-user

Avoids issues with the ownership of /var/log/nova/nova-manage.log logfile. As
the nova init script runs the db_sync task as well.
Merge pull request #246 from rhafer/release/roxy/master

Run nova-manage db_sync as the nova-user
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]
smoke should be executable
Merge pull request #258 from MirantisDellCrowbar/bug/smokeperm/roxy/master

smoke should be executable