GitLab

This will add a positional arg to run_vm_test.py that can take one of two
values:

- "host-cmd": Runs a command on the host. Just launches the vm then
immediately calls the passed in cmd on the host. It's assumed the cmd will
handle data deps, ssh commands, etc.

- "vm-test": Runs a test in the vm. Takes care of spawning the vm, pushing
the test and its deps to the vm, executing the test, and tears down the vm.
(This is the current default behavior.)

Bug: 832374
Change-Id: Ib8bd1b2e7dd393f8a4578979fa164381a8342ef2
Reviewed-on: https://chromium-review.googlesource.com/1038747
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555279}