dcp/cb: Add thisNode field in node services

Change-Id: I7ea28d5e43457505909d814be525511bb4bc106e
Reviewed-on: http://review.couchbase.org/43671
Reviewed-by: Pratap Chakravarthy <prataprc@couchbase.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>
Tested-by: Sarath Lakshman <sarath@couchbase.com>