IT unstability fix - BUG 837

- registration of node by md-sal keeps failing - if closing of connection will wait for 2 secs after handshake, md-sal should succeed in registering

Change-Id: I510defd8bbb7334eaaebc4b066d019b6de2af040
Signed-off-by: Michal Rehak <mirehak@cisco.com>