Update notes for submitted changes

* - Changes to support cross connect without scripts   - agent alive/dead detected based on addition of pkt0 vif and removal of     pkt0 interface from the system (OS)   - on agent's death, all vhost interface and their corresponding physical     interfaces are put on cross connect mode where the traffic will still     pass through vrouter   - from the time of reset till vhost gets added back again, traffic moves     directly from physical interface to vhost   - once vhost interface is added, traffic flows normally through vrouter