Added support for device discovery at oic/d.

Added support for device discovery at oic/d.

Spec compliance task for adding support for device discovery.

Using a struct for Device info with the device name field that is
expected from the application. Generate device id of type UUID and
insert string representation of uuid in discovery responses.

Updated sample apps and unit tests to support changes.
Also updated android jni, OCDeviceInfo.java class and a test in
SmokeTest.java.

Change-Id: Ib2d676d2a504fb9ff177487899f74bd121dc1d59
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1057
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Joseph Morrow <joseph.l.morrow@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>