Fix DTLS retransmission error

Fix DTLS retransmission error

Change-Id: I26360583ccd7df3cab98f2b13ca207040ddf5f35
Signed-off-by: Dmitriy Zhuravlev <d.zhuravlev@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/14513
Tested-by: jenkins-iotivity <jenkins-iotivity@opendaylight.org>
Reviewed-by: Joonghwan Lee <jh05.lee@samsung.com>
Reviewed-by: Randeep Singh <randeep.s@samsung.com>
Bug: https://jira.iotivity.org/browse/IOT-1684
Signed-off-by: Philippe Coval <philippe.coval@osg.samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/15805
Reviewed-by: Ziran Sun <ziran.sun@samsung.com>
Reviewed-by: Greg Zaverucha <gregz@microsoft.com>
Reviewed-by: Kevin Kane <kkane@microsoft.com>
Reviewed-by: Nivedita Singhvi <niveditasinghvi@gmail.com>
Reviewed-by: Habib Virji <habib.virji@samsung.com>