CBQE-0: remove conf/py-bat-kv-rebalance-tests.conf

seems like the config never used but the same set of tests can be found in conf/py-kv-rebalance-tests.conf

Change-Id: I68c7c8202c387f7bde6c4f6588134fc07e28224d
Reviewed-on: http://review.couchbase.org/34648
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>