Correct MySQL DB priv names for citest grants

The old configuration was resulting in a puppet error of...

    err: /Stage[main]/Jenkins::Slave/Database_grant
        [openstack_citest@localhost]/privileges:
        change from  to create, drop failed: The privileges
        'create,drop' are not valid. Did you mean
        'create_priv,drop_priv'?

Change-Id: I325cabe2fce8a6893b03d9deb106ed2ae2a29364
Merge "Correct MySQL DB priv names for citest grants"