Fix memory leaks in handling server requests.

Fix memory leaks in handling server requests.

Two memory leaks fixed. One after a response is sent and one when a
server request is deleted. malloc'ed tokens were not free'd in both
instances.

Change-Id: I125bab278dd8542ff5970e6655b24a5cbacfe7e9
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1040
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sakthivel Samidurai <sakthivel.samidurai@intel.com>
Reviewed-by: Erich Keane <erich.keane@intel.com>