Update observe-request processing logic.
Update observe-request processing logic.

Change-Id: Icb5ae1a3f8c8e985570b30b0420cc6e7fe98ffdc
Signed-off-by: Parkhi <654100d0d1c7f20a9144c38760887b80638a89ed@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13235
Reviewed-by: Jihun Ha <3b6954bd112a2585eced0b86af3c85401a826886@samsung.com>
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Uze Choi <3a26c91d8a4a3c9e246e43339f4782bb2483aece@samsung.com>

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