cherry-pick from lmp-mr1-dev
* Inexact alarms no longer coalesce with exact alarms. The motivation here
is that exact alarms are far more likely to be wall-clock aligned, and in
general pulling all alarms toward wall-clock alignment is a bad idea.
* Wakeup times are now fuzzed within the target batch's allowed window
rather than being hard pinned at the start of the window.
Bug 18631821
Change-Id: Iefaf34eee3f2a6546abefc27e177ee2fdcff935f
(cherry picked from commit 81f9882b5aadd6a2289c9f521a06a7af5f35ebf0)
b62aa5530e