WASHINGTON (Reuters) - FBI Director James Comey and Apple Inc (AAPL.O) Senior Vice President and General Counsel Bruce Sewell will testify at a March 1 congressional hearing on encryption issues, the U.S. House of Representatives Judiciary Committee said in a statement on Thursday. The hearing comes amid a dispute between the tech giant and the government over unlocking an iPhone used by one of the San Bernardino, California, shooters.  