Zephyr: zmake: Add test subcommand

This change adds a test subcommand to be used as follows:

$ zmake configure ...
$ zmake test ~/test/cnfg-name

BUG=b:170268806
TEST=Added a dummy test and ran zmake test on it.

Change-Id: Id4964839f7f158feec0eb8846a7d3c81fdf9a6f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/zephyr-chrome/+/2537896
Commit-Queue: Yuval Peress <peress@chromium.org>
Tested-by: Yuval Peress <peress@chromium.org>
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
2 files changed