Fix CentOS upgrade defects

* adds the sleep 10s back in after a keystone restart.
* fixup /var/log/nova/nova.log to be owned by nova on upgrade

Fixes rcbops/chef-cookbooks/issue#446
Partially resolves DE181
fix a foodcritic violation
Merge pull request #114 from rackerjoe/DE181

Fix CentOS upgrade defects
Merge branch 'grizzly' of https://github.com/rcbops-cookbooks/keystone into DE172