Remi NGUYEN VAN a911e84798 Add tests for IPv4 of dual stack tethering.
Also refactoring some Tethering and TetherInterfaceStateMachine calls
to address testability issues.

This is in preparation of other work to have IPv6-only or 464xlat
tethering working.

Test: runtest frameworks-net
Bug: 38218697
Bug: 64382985
Bug: 64976379
Bug: 64995262

Change-Id: I721aca4789ddfbee5a97316aae0b378d79ee2107
2018-03-26 11:38:34 +09:00
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