GitLab

Verifiy that all 'required' properties in a policy schema are actually
existing in 'properties' as well.

Bug: 856903
Test: components_unittests --gtest_filter=JSONSchemaValidator.*
Change-Id: Ie8c3ff8ac82bcb3c436cfb580721070050b66b22
Reviewed-on: https://chromium-review.googlesource.com/1165361Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582533}