Add a test for IdleTimerController.

Bug: 28362720
Test: bullhead builds,boots
Test: netd_{unit,integration}_test pass
Change-Id: I0e3c2462676969b26a4cbee7aa6552078fde90f5
Merged-In: Ifc7b7045f00f7803b31a22d96a04e208917af5a5
4 files changed