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Network service requires this in some situtations.

Additionally, alphabetize methods and consolidate some logic
into helper methods along the way. As part of the consolidation,
need to mask open() flags before checking "if allowed" and test
for "EFAULT" earlier in some situations.

Require "Create" permission for rename() for consistency.
Use initializer-list for vectors where possible.
Clean up hooks and tests to use bitset creation helper function.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Ide22e759692baf4350b643400619885f1676db15
Reviewed-on: https://chromium-review.googlesource.com/812452
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523255}