Fixed C and C++ sample apps.

Fixed C and C++ sample apps.

Fixed the GET fail on C++ samples.
Added logging that informs users that query processing is not
implemented and is the responsibility if the entity handler.

Change-Id: If73ee023aa739584c34d1a4ffe4656a4902f6cf3
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/943
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Mark Tung <mark.y.tung@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>