A brand of specialty mozzarella cheeses. A collection of natural-gas storage terminals. And America’s top-selling emergency contraception. At a moment when half of U.S. states stand poised to outlaw or sharply curtail abortion services, the last-ditch pill for women aiming to stave off an unwanted pregnancy rests in the unlikely stewardship of two private equity firms whose investment portfolios range from Italian foods to vineyard management to children’s cough medicine. Kelso & Co.