If you enjoy the content at iBankCoin, please follow us on TwitterWILMINGTON, Delaware (Reuters) – Warren Buffett, former top lieutenant David Sokol, and the rest of Berkshire Hathaway Inc’s (NYSE:BRK-A – News; NYSE:BRK-B – News) board of directors were sued on Tuesday by a shareholder over a trading scandal that cost Sokol his job.