CBQE-0: Enable xdcr trace for non-upgrade tests, as older version don't have support for this

Change-Id: I64326115e3e316416842c0add9b59aced57dd5dd
Reviewed-on: http://review.couchbase.org/39204
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Tested-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>