oc_dtls: send alert before discarding peer state
oc_dtls: send alert before discarding peer state

Change-Id: I65c7a41eeb33f6c52db39a388d35d6ac73b486a0
Signed-off-by: Kishen Maloor <c62ddea3cd661a9268bff15f07fc2229cdc9ac02@intel.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/23465

iotivity/iotivity-constrained,iotivity/iotivity-constrained,iotivity/iotivity-constrained,iotivity/iotivity-constrained