Make DevicePolicyManagerService more customizable (per-device).

Add a config to override the DPMS implementation class to
be instantiated from the Lifecycle.
Add a hasFeature method to the Injector class.

BUG: 63753860
Test: manual with TestDPC

Change-Id: I71ef518c49b2233744defdfb7c31019cb228d678
4 files changed