Keith Morris is not an easy guy to get a hold of. I mean that quite literally. The legendary hardcore punk rock vocalist - who plays the Mercury Ballroom with the Circle Jerks on September 15th, and who turns 69 years old on September 18th - is still far more punk than any of us, as he refuses to own a cell phone, (at least until the end of September, when he’s reluctantly forced to get one due to a new diabetes monitoring device that only works…