Puppet the Gerrit bcprov and mysql-connector deps

* modules/gerrit/manifests/init.pp: The gerrit installer adds
jarfiles for bcprov and mysql-connector into its lib directory, but
puppet needs to know how to add them itself.

Change-Id: Id61260d0d28f1aadf85dc8604688b0131cddf682
Merge "Puppet the Gerrit bcprov and mysql-connector deps"