Image courtesy of Pittsburgh Steelers The first offensive line domino has fallen for Eliot Wolf and Jerod Mayo. Despite free agency not officially starting until next week, the Pats signed former Steelers tackle Chukwuma Okorafor on Thursday after he had been waived by Pittsburgh, which is why he could sign early. This is an important first step in trying to rebuild the O-line, although pieces like Sidy Sow, Cole Strange…