Fix C client to receive presence notifications.

Fix C client to receive presence notifications.

This fixes IOT-432.
Make occlient.cpp subscribe to the same resource ocserver.cpp is sending
out presence notifications on. Server sends out notifications for
core.led while client was subscribed to core.light.

Signed-off-by: Mandeep Shetty <mandeep.shetty@intel.com>
Change-Id: I8aeb96b981f1bb71ce0661f1fa54d58ba1a19b8c
Reviewed-on: https://gerrit.iotivity.org/gerrit/626
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Erich Keane <erich.keane@intel.com>