remove old xdcr path

Change-Id: If94c0f3e35673136a6224650afd18163e47e4b67
Reviewed-on: http://review.couchbase.org/38446
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Artem Stemkovski <artem@couchbase.com>