fix unneeded mysql::server for Galera support

This patch fixes the unneeded mysql::server dependency for creating databases.  This patch is important because our database HA implementation uses Galera.  Without the patch, creating OS databases using Galera will fail because of this unneeded dependency.  See the following bug for more details:

https://bugs.launchpad.net/openstack-cisco/+bug/1211474

A pull request has been submitted upstream, but Dan B has suggested that we maintain this patch ourselves:

https://github.com/puppetlabs/puppetlabs-mysql/pull/231