scripts: Remove unused scripts.

Remove cros_run_vm_test and cros_run_vm_update.

BUG=chromium:782664
TEST=bots

Change-Id: Ia52d716cca7a21ef3a4b30d553ed8e71e70eff6b
Reviewed-on: https://chromium-review.googlesource.com/1384578
Commit-Ready: Achuith Bhandarkar <achuith@chromium.org>
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Alex Zamorzaev <zamorzaev@chromium.org>
2 files changed