Minuteman bassist Mike Watt’s plaid-shirted affability brought good vibes to Southern California punk rock’s surly disposition. Which partially explains why the alt-rock pantheon turned out for Watt’s all-hands solo debut, Ball-Hog or Tugboat? Joined by Dave Grohl (drums), Eddie Vedder (guitar), Pat Smear (guitar) and William Goldsmith (drums), Watt took his solo act on the road with…