Update C++ OCPlatform Unit test
Update C++ OCPlatform Unit test

Add unit test for external OCPlatform APIs

Change-Id: I0c17134429f99b9a6d28a79b248c92b2ad84b989
Signed-off-by: Sakthivel Samidurai <2b42ef6ad9ddc9eb44e2c60668b448d90a7d2d41@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/573
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Doug Hudson <b04bafbc81ee8df410ecf2f46758b79c3c711082@intel.com>
Reviewed-by: Erich Keane <ec9f61fe526c14bb62c55d7c978f025ee6b3583d@intel.com>

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