CBQE:0 Enable xdcr tracing after node restarts

Change-Id: Iccf967e614a16b8d92f04cb1031584ac64fc90bf
Reviewed-on: http://review.couchbase.org/41267
Reviewed-by: Aruna Piravi <aruna@couchbase.com>
Tested-by: Aruna Piravi <aruna@couchbase.com>