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There were multiple instances of same virtual resource strings
within C stack. This was a cause of 'many' recent un-intended bugs
in the Ioptivity stack. Updated octypes public interface to publish
'reserved' virtual resources and those can be used by applications.
Also updated associated sample applications.

Change-Id: I587727a63dace0086cc27b994bdf238ad203daa4
Signed-off-by: Sachin Agrawal <sachin.agrawal@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1620Reviewed-by: Erich Keane <erich.keane@intel.com>
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>