Update puppet-galera to latest master.

[jguiditta]

Changes include:

• support for current puppet-mysql, pacemaker galera resource agent
• Add metadata.json file

Hash references:

• old commit: a63ab112aabdc9faa5e66fc095ef9dcc865d6999
• new commit: f7d4110886b643eb63dc5c347a0e8a06b09642e7

[jguiditta]

This PR is a dependency needed for https://github.com/redhat-openstack/astapor/pull/404 to work as expected