ALLJOYN-1638 Instabilities seen on ICE transport while running Chat application on seven devices

Change-Id: I682ae73bde4d341e392e814d0d5aede9b58e8a8f
ALLJOYN-1632 Ensure that socket is closed only once.

Change-Id: I7f62cfd89be3028e2a51c4908d9cae0e54115728
Update some ICE related comments

Change-Id: Ib7ce6c610ca7ea24dfc0dd2b1e087a9f40cd6e2a