Convert IdletimerController to iptables-restore.

Bug: 28362720
Test: bullhead builds,boots
Test: netd_{unit,integration}_test pass
Change-Id: I435346a25a25df23e72dbc5be4ead0782e36c78d
Merged-In: Ifc7b7045f00f7803b31a22d96a04e208917af5a5
3 files changed