By Michelle Price and Sinead Cruise WASHINGTON/LONDON (Reuters) -The U.S. units of major European lenders including Deutsche Bank, Barclays and Credit Suisse sailed through the Federal Reserve’s annual “stress tests” on Thursday, showing they hold enough capital to weather an economic shock. For the seven European bank subsidiaries the Fed oversees with more than $100 billion in assets, the average capital ratio — a measure of the cushion a bank has to withstand potential losses — remained well above the regulatory minimum of 4.5%. It was also higher than the average ratio for the broader gr…