1. Add addressUpdated and addressRemoved methods to
INetworkManagementEventObserver. (The -Updated method is not
called -Added because it gets called for both adds and
changes.) Update all its callers in the tree.
2. Make NetworkManagementService parse IP address notifications
from NetlinkHandler and call the address{Removed,Updated} on
its observers.
Bug: 10232006
Change-Id: Ieb185dbba052bdbff03caafc0cf5397a7f04dc6d
5c7daac2e3