MIAMI — For the second time in two weeks, a large group of Haitian migrants has come to shore in the Florida Keys. Monroe County Sheriff Rick Ramsay said 100 to 150 people arrived in a sailboat Monday morning off Summerland Key, about 20 miles from Key West. Photos provided by the sheriff’s office show a large group of people gathering in the yard of an oceanfront home on Summerland Key. It is unclear whether the boat came directly from Haiti or elsewhere in the Caribbean. But last week, a source in Haiti who monitors maritime migrant operations told the Miami Herald that two boats had left th…