CBQE:0 Enable trace logging in XDCR upgrade tests

Change-Id: I8d3d38eaa163b0f621ee405194a1b74525d9e900
Reviewed-on: http://review.couchbase.org/40318
Reviewed-by: Sangharsh Agarwal <sangharsh.agarwal@globallogic.com>
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>