Fix issue #21814207 and issue #21814212 (alarm manager)

Issue #21814207: AlarmManager.setAndAllowWhileIdle should also allow wake locks.

Introduce a whole new infrastructure for providing options when
sending broadcasts, much like ActivityOptions.  There is a single
option right now, asking the activity manager to apply a tempory
whitelist to each receiver of the broadcast.

Issue #21814212: Need to allow configuration of alarm manager parameters

The various alarm manager timing configurations are not modifiable
through settings, much like DeviceIdleController.  Also did a few
tweaks in the existing DeviceIdleController impl.

Change-Id: Ifd01013185acc4de668617b1e46e78e30ebed041