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We collect logs from the VM after tests. The problem is, if the test
hangs indefinitely, we won't get a chance to grab the logs before
swarming kills us when we reach the timeout.

Swarming sends a SIGTERM, waits for grace_period, then SIGKILLs the task
if it's still running. This CL will catch the SIGTERM and kill what
should be the frozen test process. This will let cros_run_vm_test pull
the logs before we get SIGKILLed.

Bug: 848402
Change-Id: I48be1de865e3b287584978b5461f15e2bae49dfd
Reviewed-on: https://chromium-review.googlesource.com/1087800
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565357}