Make zigbee client use OCDevAddr struct instead of a char string.

Make zigbee client use OCDevAddr struct instead of a char string.

Sticking the ip and port into a char string with resource uri opens up
potential errors due to incorrect parsing. Use OCDevAddr struct instead
as it is meant to be used for cleaner and less fragile code.

Change-Id: I31eb7c4d39d55f7163cffbf85bc12ccb7cf77a0d
Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/2939
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Jon A. Cruz <jonc@osg.samsung.com>