CBQE-0: py-xdcr-bidirectional.conf with diff bucket types

Change-Id: I14b66b8342452263f753b43207592114008a8c5c
Reviewed-on: http://review.couchbase.org/33386
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>