Addressed format specifier, unused variable, etc, build warnings.

Addressed format specifier, unused variable, etc, build warnings.

Change-Id: I8ccfc5e185cfea2555ac5337eb2afa897f1984e4
Signed-off-by: Ossama Othman <ossama.othman@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/13725
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: David Antler <david.a.antler@intel.com>
Reviewed-by: Habib Virji <habib.virji@samsung.com>