Fix error message about moved configuration items.
Fix error message about moved configuration items.

kelle/astropy,DougBurke/astropy,AustereCuriosity/astropy,larrybradley/astropy,larrybradley/astropy,funbaker/astropy,saimn/astropy,aleksandr-bakanov/astropy,stargaser/astropy,pllim/astropy,bsipocz/astropy,StuartLittlefair/astropy,lpsinger/astropy,MSeifert04/astropy,kelle/astropy,pllim/astropy,astropy/astropy,tbabej/astropy,bsipocz/astropy,mhvk/astropy,mhvk/astropy,larrybradley/astropy,stargaser/astropy,dhomeier/astropy,bsipocz/astropy,MSeifert04/astropy,joergdietrich/astropy,astropy/astropy,pllim/astropy,DougBurke/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,lpsinger/astropy,tbabej/astropy,MSeifert04/astropy,AustereCuriosity/astropy,mhvk/astropy,lpsinger/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,AustereCuriosity/astropy,funbaker/astropy,astropy/astropy,StuartLittlefair/astropy,funbaker/astropy,larrybradley/astropy,funbaker/astropy,larrybradley/astropy,AustereCuriosity/astropy,StuartLittlefair/astropy,stargaser/astropy,aleksandr-bakanov/astropy,tbabej/astropy,mhvk/astropy,stargaser/astropy,StuartLittlefair/astropy,joergdietrich/astropy,saimn/astropy,saimn/astropy,astropy/astropy,DougBurke/astropy,pllim/astropy,kelle/astropy,saimn/astropy,MSeifert04/astropy,dhomeier/astropy,tbabej/astropy,joergdietrich/astropy,joergdietrich/astropy,tbabej/astropy,kelle/astropy,StuartLittlefair/astropy,dhomeier/astropy,joergdietrich/astropy,saimn/astropy,lpsinger/astropy,bsipocz/astropy,DougBurke/astropy,astropy/astropy,AustereCuriosity/astropy,mhvk/astropy,kelle/astropy,lpsinger/astropy,pllim/astropy