By Lewis Krauskopf NEW YORK (Reuters) -Investors will look to major banks' quarterly earnings reports in the coming week to help gauge the U.S. economy's health as the federal government shutdown has interrupted the flow of new data. Major U.S. equity indexes slumped on Friday, stalling the market's momentum, after comments from President Donald Trump ratcheted up trade tensions with China. Stocks ended the week on a dour note just before the benchmark S&P 500 is set to mark the third anniversary of the start of its current bull market run on Sunday. Markets had been overbought and due for some volatility, said Matthew Miskin, co-chief investment strategist at Manulife John Hancock Investments. "At the end of the day, it's going to come back to the economy," Miskin said. "It's going to com

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