turn a=b argument passing into a b argument passing in cros_run_vm_test

This should help resolve a possible incompatilibility between the
version of python argparse on different builders.

BUG=None
TEST=tested that test_that should accept arguments with ' ' instead of
'='.

Change-Id: Ibd2e92659c90ae7865dfdf0e3f77a1734d14f021
Reviewed-on: https://chromium-review.googlesource.com/168128
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Matt Tennant <mtennant@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
1 file changed