Adds what package must be installed for kvm-ok command to work

fix bug 1161089

Change-Id: I260471c9a132bf2acbbc4e5b233ee885d6136a10
root_helper --> rootwrap_config

root_helper was deprecated in nova, and replaced with
rootwrap_config

fixes bug 1166754

Change-Id: Ib8daea6b26ac6d6b0fcc29610650d7d03fca8f4c
Merge "Adds what package must be installed for kvm-ok command to work"