Send ack response when the request is CON for presence

Send ack response when the request is CON for presence

If resource-client subscribe presence with CON, resource-server
should send the response message to stop the retransmission.

Change-Id: I90008dffc6a8940c9f1645c27d4ded6efa6d9421
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/10755
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jaehong Jo <jaehong.jo@samsung.com>
Reviewed-by: jihwan seo <jihwan.seo@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>