MB-8347: advertise cancel XDCR endpoint without typo

We still support old call so that if somebody have hardcoded wrong
path they still have some time to migrate.

Change-Id: Ib6a21e2352f59fd18b6318da6e232726c2df1ccd
Reviewed-on: http://review.couchbase.org/26505
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Merge remote-tracking branch 'origin/2.0.2'

* origin/2.0.2:
  MB-8347: advertise cancel XDCR endpoint without typo

trivial merge

Change-Id: If60dd8acf28a7c3c0ac99b6c7ddc2d9130e5fab4