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This fixes a bug in the runner scripts which prevented SSH cred
generation for device boots, but allowed emulator run credentials to
be re-used. The issue only manifested on clean builds with no prior
emu runs.

Bug: 899285
Change-Id: Icfb2b734bf527b44cb671b08ee7d21563ae82a8c
Reviewed-on: https://chromium-review.googlesource.com/c/1355850Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612839}