Update puppet-galera to latest master.

Changes include:
 - support for current puppet-mysql, pacemaker galera resource agent
 - Add metadata.json file

Hash references:
 - old commit: a63ab112aabdc9faa5e66fc095ef9dcc865d6999
 - new commit: f7d4110886b643eb63dc5c347a0e8a06b09642e7