By Elizabeth Piper LONDON (Reuters) – Out of power for a matter of months, comeback king Boris Johnson is once again being touted as the new leader of the governing Conservative Party and Britain’s prime minister. The man who was forced to quit as prime minister in July, brought down by some of the very lawmakers he now hopes will rally around him, is, according to Conservatives and a former aide, taking soundings to see if he has the support to return. It would be an extraordinary political resurrection for the former journalist, who left office shrouded in scandal but defiant, grumbling that…