added REST API to cancel recovery of node

Change-Id: I600bcd051fc44e03e81706610e21be4b24d44e4f
Reviewed-on: http://review.couchbase.org/37084
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>