devinstall_test: Use cros_vm instead.

Use cros_vm instead of chromite/vm to remove a dependence on
cros_start_vm.

BUG=chromium:782664
TEST=Run devinstall_test.py
CQ-DEPEND=CL:982819

Change-Id: I7fe665d5d0df8e5caef9ce5f3ec1369e1e56be88
Reviewed-on: https://chromium-review.googlesource.com/982748
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
1 file changed