CBQE-o: remove conf/py-newrebalance_rc2.conf

Change-Id: I76feac366f5a6fe08df1ceec7bfc09d7e4880812
Reviewed-on: http://review.couchbase.org/27111
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>