[rel-3.0.2] Move tlm back to 3.0 branch

The tlm project in the 3.0.2 manifest was pointing to tlm/master,
unlike 3.0.0 and 3.0.1 which used the '3.0.0' branch. Updating 3.0.2
to also use the same branch.

Change-Id: Ie8809716dc36c812af5621e1f42c30cf50027b67
Reviewed-on: http://review.couchbase.org/43764
Reviewed-by: Chris Hillery <ceej@couchbase.com>
Tested-by: Chris Hillery <ceej@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>