Don't try and delete the same user from mysql twice

For security reasons we remove the anonymous user from mysql
"@localhost", we also remove "@hostname", this commit checks that the
hostname is not localhost so that we don't try and remove the same user
twice
https://bugzilla.redhat.com/show_bug.cgi?id=905737

Change-Id: If5e99b27503220b3308b487bb2912a39b24a3d05
Merge "Don't try and delete the same user from mysql twice" into folsom