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Previously the runner script was copying packages to /data when
installing them. On some devices (e.g. VIM2) /data is significantly slower
than /tmp. On VIM2 This change reduces media_unittests installation delay
from more than 45s to less than 5s.

Change-Id: Iea4a25abede1f41b28c7194969eb62286f476bbc
Reviewed-on: https://chromium-review.googlesource.com/c/1284392Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600674}