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As the syscall_broker process becomes more capable, it is important
not to expose all the new capabilities to old clients which do no
require them. Introduce a set of flags to track allowed commands.

Rename broker_common.{cc,h} to broker_command.{cc,h} since all the
contents are related to commands issued to the broker. Consolidate
client/host side checks in this new file.

Parameterize some tests so we cover both client/host denials.
Tidy, brace initialize some vectors for readability.


Cq-Include-Trybots: master.tryserver.chromium.android:android_arm64_dbg_recipe;master.tryserver.chromium.android:android_compile_x64_dbg;master.tryserver.chromium.android:android_compile_x86_dbg;master.tryserver.chromium.linux:linux_mojo
Change-Id: I1ca23543f54e3eb5445bd476c24cf4a1bed06c37
Reviewed-on: https://chromium-review.googlesource.com/801936
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521568}