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This CL is not a trivial moving of files. It is for the most part just
moving pieces of different files around.

- bluetooth_util is split into two parts
- test_util is split into two parts
- Refactor DEPS a bit
- Create OWNERS

BUG=internal b/76121501
TEST=Build and run cast_bluetooth_unittests, cast_internal_bluetooth_unittests

Change-Id: Ic8eff107be097c9ec765bf3337c2d9b2665dbaaf
Reviewed-on: https://chromium-review.googlesource.com/977223Reviewed-by: Stephen Lanham <slan@chromium.org>
Commit-Queue: Bailey Forrest <bcf@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546549}