Lauren Leigh Bacho/GettyImages The Patriots signed veteran cornerback Carlton Davis to a three year, $60 million dollar deal. Davis is going to get $34.5 million guranteed. A pure man to man cover corner, Davis has been one of the top corners in the NFL the past four seasons. Last season, Davis posted the seventh-lowest completion percentage allowed as the nearest defender in man coverage (45.2), per Next Gen Stats. He…