"I don't think many tech companies execute M&A well." Palo Alto Networks CEO @nikesharora breaks down his strategy for successful M&A: "Purchase price is an irrelevant artifact. If it's going to work, it's going to work phenomenally well, or you're going to screw it up. It's not what you paid, it's what you're able to do with it." "You could say that Instagram was expensive, or YouTube was expensive, or DoubleClick was expensive. They all worked perfectly. AOL Time Warner is a different…