[IOT-1538] Add support for Protocol-Independent ID

[IOT-1538] Add support for Protocol-Independent ID

Per OCF Core CR 64: add support for a protocol-independent ID of a
device, in /oic/d, for use with de-duping information discovered via
more than one protocol (OCF, AllJoyn, UPnP, WS-Discovery, etc.). The
other protocols already carry a UUID for this purpose.

Change-Id: I2c6f5f2a29d09b2a120d450708360bcd61c08b3c
Signed-off-by: Dave Thaler <dthaler@microsoft.com>
Signed-off-by: Dan Mihai <Daniel.Mihai@microsoft.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14261
Reviewed-by: George Nash <george.nash@intel.com>
Tested-by: jenkins-iotivity <jenkins@iotivity.org>
Reviewed-by: Mike Fenelon <mike.fenelon@microsoft.com>