By Raphael Satter WASHINGTON (Reuters) -A former Wall Street Journal reporter is accusing a major U.S. law firm of having used mercenary hackers to oust him from his job and ruin his reputation. In a lawsuit filed late Friday, Jay Solomon, the Journal’s former chief foreign correspondent, said Philadelphia-based Dechert LLP worked with hackers from India to steal emails between him and one of his key sources, Iranian American aviation executive Farhad Azima. Solomon said the messages, which showed Azima floating the idea of the two of them going into business together, were put into a dossier …