Close all tunnels onUnbind

Close all tunnels onUnbind
as there are no clients left.
This is to handle the case when
phone process (client) dies - we need
to clean up/close the tunnels

Bug: 179419591
Test: - ondevice vowifi call
      - killed phone process and verified
      the tunnels are closed
      - unit tests
Change-Id: Ic1cacb864043dae05968eb697a55f19cd4288d73
1 file changed