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The new test verifies that StartMini() succeeds even when stopping
arcvm-server-proxy job fails.

BUG=None
TEST=try

Change-Id: Iadb8c421b31299cf904978b7e487599969a4c11b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083406Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Yusuke Sato <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746210}