CBQE-0: fix conf ui xdcr tests

Change-Id: I896d478887f915ed41a4c7e396987b199784772f
Reviewed-on: http://review.couchbase.org/41911
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Iryna Mironava <irynamironava@yandex.ru>