Fixed typo
Fixed typo

One line was forgotten during MySQL->MariaDB rename, which caused
failures for deployments when MariaDB should be installed
on separate host.

Change-Id: I5b4268868c0f811d9d4aca96aabb4ea120a86285
Fixes: rhbz#1150348

palmer159/openstack-test,xbezdick/packstack,stackforge/packstack,stackforge/packstack,stackforge/packstack,fr34k8/packstack,imcsk8/packstack,imcsk8/packstack,openstack/packstack,mahak/packstack,mahak/packstack,fr34k8/packstack,mahak/packstack,xbezdick/packstack,fr34k8/packstack,palmer159/openstack-test,xbezdick/packstack,openstack/packstack,palmer159/openstack-test,imcsk8/packstack,openstack/packstack