Addition of Zuul v3 initscripts raced the dynamic pidfile directory
creation fix Idfd5d19e5171278b9bb7005edb4ae927a01f3615. Port it to
them so that if the PIDFILE variable is overridden for a custom
path, we create the correct parent directory.
Change-Id: I3af4e0eb280eed5dfeab909ad4e3fb24ede75a5a