Former reality star NeNe Leakes has sued Bravo and NBCUniversal, alleging that her bosses there turned a blind eye to the racism and hostility she faced from castmate Kim Zolciak-Biermann for years on the set of “Real Housewives of Atlanta.” Leakes, 54, named the network, executive producer Andy Cohen and the production companies True Entertainment and Truly Original in her lawsuit, filed Wednesday and obtained by the Daily News. Zolciak-Biermann was not named. “NBC, Bravo and True foster a corporate and workplace culture in which racially-insensitive and inappropriate behavior is tolerated — …