temp test for xdcr unidir 2b case
update test for xdcr bidir 2b case

re-do of two commits, one that was pushed directly to gerrit (oops),
and the following commit pushed directly to github (also oops)

Change-Id: Ifaf7275f7abcda6b4531e9c48d865b25589fff65
Reviewed-on: http://review.couchbase.org/41974
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>