[autotest] Add paygen_au_* suite control files to autotest

All the obsolete suite control files(suites don't have tests for them in TOT)
have been removed from autotest. However, paygen_au_* suite control files are
included, but these suite control files actually have a special logic to
dynamically generate tests at run time. For now, plan to add these suite
control files back. However, later on, maybe we should change the
suite_scheduler to fully depreciate this special logic.

Also add paygen_au_* to attribute_whitelist.txt, a file contains all the valid
suite name in autotest.

BUG=chromium:495335
TEST=Test locally

Change-Id: Iea5e45e852a71898aac8ae8620e0c57a38235ea9
Reviewed-on: https://chromium-review.googlesource.com/274531
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Tested-by: Shuqian Zhao <shuqianz@chromium.org>
5 files changed