Bug-2208: Added ability to configure keepalive and deadtimer

-d, --deadtimer <0..255> (optional, default 120) - DeadTimer value in seconds
-ka, --keepalive <0.255> (optional, deafult 30) - KeepAlive timer value in seconds

Change-Id: I1fcc983f96793853d719ed8c5aaa241e848801b4
Signed-off-by: Milos Fabian <milfabia@cisco.com>