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For Apple Developer accounts associated with multiple development teams
(as mine is), altool requires --asc-provider to select a team any time
--username is used. Arguments are added to the sign_chrome.py and
notarize_thing.py notarization drivers whose values are propagated to
altool as needed.

For most Apple Developer accounts associated only with a single
development team, --asc-provider is not necessary.

This also removes --no-dir-entries from the zip command used to build an
archive for notarization, because if the code was signed with empty
directories, they need to be present for notarization too.

Bug: 980334
Change-Id: I646f3ee5729030df01ea200b9e72138626208931
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1682685
Commit-Queue: Mark Mentovai <mark@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678370}