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This CL does four things:
* Support 'sensitiveValue': True for regular policies defined in
  policy_templates.json
* Improve de-duplication logic for SchemaNode generation by also
  re-using more complex schemas. (Reduces number of |SchemaNode|s from
  180 to 131)
* Fix a crash if 'sensitiveValue': True was applied to a schema with
  type 'list' or 'object' (see |CopyAndMaybeConvert()| in
  policy_conversion.cc) and added tests for this.
* Add documentation about 'sensitiveValue' to policy_templates.json.
* Make use of namedtuples in generate_policy_source.py

Bug: 905357
Change-Id: If3889ada705d9576165c2467f6dd8d9376e54886
Reviewed-on: https://chromium-review.googlesource.com/c/1337346Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Lutz Justen <ljusten@chromium.org>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613228}