[1/2] Companies May 17 (Reuters) - With Elon Musk outlining plans for Tesla Inc (TSLA.O) to use traditional advertising for the first time, viewers might see the electric-vehicle maker's Model Y crossover or upcoming Cybertruck pickup - maybe even the billionaire CEO himself - on TV or online. Musk revealed those plans on Tuesday at the company's annual meeting, an about-face for the celebrity executive who recently acquired social media platform Twitter. He has for years eschewed advertising...