nova: Only run the mysql test setup commands
nova: Only run the mysql test setup commands

I1528a261d0c9fc3841905b12bf09318a6c3dcb83 merged early and actual
testing downstream highlighted that we can skip the postgresql
configuration steps within this script.

Change-Id: I92d0e0f340dfc9ba4e06a138d861ee9d6bac5564

redhat-openstack/octario,redhat-openstack/octario