ST. LOUIS — For 16 outs Sunday, White Sox right-hander David Sandlin’s return from Triple-A Charlotte was going perfectly. ‘‘He just was in complete control,’’ catcher Kyle Teel said. ‘‘You could see it in his eyes.’’ Shielding his vulnerable four-seam fastball behind a seven-pitch mix, Sandlin looked like a solution to the Sox’ shortage of starting pitching. Before he could reach 18 outs, however, two soft singles broke up Sandlin’s perfect gam…