By Luc Olinga The CEO of Tesla has often made big promises. But he doesn’t always hold to them. Elon Musk built Tesla (TSLA) – Get Tesla Inc Report with spectacular promises. This is his strength, say his admirers. It’s his visionary side, they say, applauding. But If he has kept some of these commitments, they were often not on time. It would be reasonable to say that the billionaire has almost always been late compared with the schedule he he’d laid out. And one of his key promises has yet to materialize: autonomous vehicles. Musk had promised that Tesla cars would be self-driving in 2018. “…