Run gitlint with tox

Run gitlint with tox

Verification of git message is failing because of a pip installation
issue:
https://github.com/jorisroovers/gitlint/issues/535
https://github.com/pypa/pip/issues/12372

The issue has been addressed for pip v23.3.2:
https://github.com/pypa/pip/releases/tag/23.3.2

but the virtual environment for the pre-commit hook does not appear to
have the version available yet.

Run the gitlint with tox directly until the issue is resolved in the
Jenkins environment.

Change-Id: I033240f8f7bb5a14217dbc763687ac490ae4b3d0
Signed-off-by: Sangwook Ha <sangwook.ha@verizon.com>