[IOT-1043] [RI] Canceling observation using RESET is not working

[IOT-1043] [RI] Canceling observation using RESET is not working

Related JIRA ticket : https://jira.iotivity.org/browse/IOT-1043

Change-Id: I7f984fe8f649af0681352fed14f8a37d73b2eba9
Signed-off-by: hyuna0213.jo <hyuna0213.jo@samsung.com>
Signed-off-by: Abhishek Sharma <ce.abhishek@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/7451
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sungkyu Ko <sungkyu.ko@samsung.com>
Reviewed-by: Gihong Kim <k1358.kim@samsung.com>
Reviewed-by: Ashok Babu Channa <ashok.channa@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/7719
Reviewed-by: Jon A. Cruz <jon@joncruz.org>