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- generate single CAF event per device, for its lifetime
- avoid sending RLZ pings too early in the device lifetime
- do the above while respecting chromeos privacy guarantees

The exact changes are described in the PRD and design doc:

https://docs.google.com/document/d/1Q3UnTO9PSKd8oIysOSV7M5mv3x3o8pK3IaV45NL9riM/edit?usp=sharing
https://docs.google.com/document/d/1BC9O0fXCEP56T619jZTyuELrMPVO4PFRkvUEHo8dmwk/edit#

This change also fixes a bug that did not stop the ShutdownCheck() even after
completing an RLZ ping.

Bug: 820783
Change-Id: Iec2a017504fa43d7fda2db5c77a1c9de2cacff2a
Reviewed-on: https://chromium-review.googlesource.com/959601Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Wenzhao (Colin) Zang <wzang@chromium.org>
Commit-Queue: Roger Tawa <rogerta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543363}