Addressed warnings that occurred when security was enabled.

Addressed warnings that occurred when security was enabled.

Use memcpy() instead of OICStrcpyPartial() to copy remote endpoint
identity related binary data.  This addresses a pointer signedness
warning caused by a unsigned char* vs char* type mismatch.

Change-Id: I224d51439d57a0b86ae6ccb44aff5ece427459f8
Signed-off-by: Ossama Othman <ossama.othman@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/1384
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Sachin Agrawal <sachin.agrawal@intel.com>