Gets ash_unittests --mash actually running tests again

Apparently a line like:

// foo

in the filter file results in all the other lines of the filter file
being ignored. This meant ash_unittests --mash on the bots wasn't
running any tests. Fixing the line shows a bunch of new tests are
failing. I've added them to the end and file a bug to recategorize
them.

I'll fix the bug in the filter file parsing separately.

BUG=813115
TEST=test only changes

Change-Id: If27f6e0738c4571c60e16bf87db6ba5cfac5cea3
Reviewed-on: https://chromium-review.googlesource.com/924270
Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537352}

• testing/buildbot/filters/ash_unittests_mash.filter[diff]