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Send policy-provided untrusted authority certificates to the network
service along with trust anchors.
Add a browsertest which checks that untrusted authority certificates
provided through user policy are respected.
Also, document certificate-related files in chromeos/test/data/network
and provide a script to generate those.

Bug: 897233
Test: browser_tests --gtest_filter=*PolicyProvided*
Change-Id: I1e66700b14e5d75805f16365e5979e84f278e8ec
Reviewed-on: https://chromium-review.googlesource.com/c/1336132
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609424}