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The test was leaking an empty key on TearDown. With this change, it
deletes the key if it was created in SetUp and also deletes an empty key
left behind by previous test runs.

Additinally, tests from this harness must run serially since they all
interact with the ServiceControlManager and centralized machine
state. As such, build and run them into setup_unittests rather than
installer_util_unittests.

This change also introduces a use of ScopedInstallDetails to configure
state for system-level operations (the only case in which the code under
test will run).

BUG=1059314

Change-Id: I6f3a35cda45704e9195dfae25a90401fb8915c6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2095540
Auto-Submit: Greg Thompson <grt@chromium.org>
Reviewed-by: S. Ganesh <ganesh@chromium.org>
Commit-Queue: S. Ganesh <ganesh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748804}