Remove galera module
Remove galera module

It's not needed anymore, and it was reintroduced by the Gnocchi
patch.

Change-Id: I3e759b24c1b6e20f911db3bbba452bac9a48730f

stackforge/packstack,fr34k8/packstack,imcsk8/packstack,mahak/packstack,openstack/packstack,stackforge/packstack,fr34k8/packstack,imcsk8/packstack,imcsk8/packstack,mahak/packstack,stackforge/packstack,mahak/packstack,openstack/packstack,fr34k8/packstack,openstack/packstack