CBQE-0: updateworker.sh with couchbase/testrunner.git

I guess we shouldn't use  membase/testrunner.git repo

Change-Id: Id59be8888ec4ab4c32153ab554bba3d1f3b190d4
Reviewed-on: http://review.couchbase.org/28295
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>