create_venv: do not hide errors/warnings by default

If we aren't using --verbose, we should still show all warnings/errors.

BUG=chromium:997354
TEST=running with bogus inputs show full error logs w/out --verbose

Change-Id: I9c681e8b3e7b92cb8613cf4362f55e10b9c39177
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra_virtualenv/+/2136296
Reviewed-by: Chris McDonald <cjmcdonald@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/venv/cros_venv/scripts/create_venv.py b/venv/cros_venv/scripts/create_venv.py
index 543ab7e..b7d0ee6 100644
--- a/venv/cros_venv/scripts/create_venv.py
+++ b/venv/cros_venv/scripts/create_venv.py
@@ -47,7 +47,7 @@
     if verbose:
         logging.basicConfig(level='DEBUG')
     else:
-        logging.getLogger().addHandler(logging.NullHandler())
+        logging.basicConfig(level='INFO')
 
 
 if __name__ == '__main__':