CBLT-159:  prepare_release_android jobs now have defaults build numbers per edition

Change-Id: Ic1f82bc3df0f62e4f62210183afb99ffeace9b76
Reviewed-on: http://review.couchbase.org/37909
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>