Add OxM Select API and MOT related API.

Add OxM Select API and MOT related API.

- Add OxM Select API on C layer.
  : OCSelectOwnershipTransferMethod

- Add OT/MOT related API on C++ layer.
  : OCSecureResource::getMOTMethod
  : OCSecureResource::getMOTMethod
  : OCSecureResource::isMOTSupported
  : OCSecureResource::isMOTEnabled

- Minor bugfix in OT/MOT.

Change-Id: I476fafe3f69f8bcb00036d60be1ab92ad74c6aae
Signed-off-by: Chul Lee <chuls.lee@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15577
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-by: Alex Kelley <alexke@microsoft.com>
Reviewed-by: Jihun Ha <jihun.ha@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
(cherry picked from commit 6ba3036950661ab8c8b4d868adfe80ba12b2f531)
Reviewed-on: https://gerrit.iotivity.org/gerrit/15795