GOODLETTSVILLE, Tenn., 2016-Jan-26 — /EPR Retail News/ — Dollar General Corporation (NYSE:DG) today announced that Rick Dreiling will step down as a member and the chairman of the board of directors of Dollar General effective January 29, 2016 and it has named Michael M. “Mike” Calbert as non-executive chairman effective January 30, 2016. Calbert has been a…