cros_run_unit_tests: Log the unit test command

BUG=chromium:365301
TEST=Emerged cros-testutils to chroot and ran cros_run_unit_tests.

Change-Id: I98014513db2cd7ac60d1c2e9160a8620c3ed7f6e
Reviewed-on: https://chromium-review.googlesource.com/195809
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
1 file changed