Added jobs for MongoDB and Percona datastores

Reasons:
 - for provisioning Trove instance we've used publisher to push images to tarball.o.o,
   but we(Trove devs) did this only for MySQL datastore.
   It is time to go forward and add another tested datastores, such as:
   - percona
   - mongodb

Change-Id: I44c7e113e6a51ff61683c57f82287b84fc38f27b
Merge "Added jobs for MongoDB and Percona datastores"