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In order to limit the introduction of issues when creating new milestone
buckets or making modifications in the presence of milestone buckets,
the creation of the buckets and setting module level defaults was
abstracted into functions so that files could be copied to the new
milestone directory and only having to add a milestone vars file. With
the removal of milestone buckets, these functions only introduce an
unnecessary level of indirection.

Change-Id: Iececeb1a9e122f2f8e862697d453ee731ffdeb98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2467547Reviewed-by: Erik Staab <estaab@chromium.org>
Commit-Queue: Erik Staab <estaab@chromium.org>
Auto-Submit: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816747}