CBLT-332:  also run unit tests when building java client

Change-Id: If0bdaab3049c0dd3d16148904c8be0c77461b1e4
Reviewed-on: http://review.couchbase.org/41988
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>