Add Active Directory cache lifetime policies

Adds policies to control the lifetime of cached Active Directory Group
Policy Objects (GPOs) and cached authentication data. Both policies will
be used in the authpolicy daemon in Chrome OS. The caches reduce server
load (prevent unnecessary GPO downloads) and improve sign-in speed.
The policies apply to Active Directory managed Chrome OS devices only.

BUG=chromium:908342, chromium:912312
TEST=Tryjobs, tested on device that policies show up in chrome://policy

Change-Id: I2f2d68fb78816aa14c950accdf31e8008f072ec8
Reviewed-on: https://chromium-review.googlesource.com/c/1374979
Reviewed-by: Thiemo Nagel <tnagel@chromium.org>
Reviewed-by: Julian Pastarmov <pastarmovj@chromium.org>
Reviewed-by: Roman Sorokin <rsorokin@chromium.org>
Commit-Queue: Lutz Justen <ljusten@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616657}
5 files changed