fix frame attribute import in test
fix frame attribute import in test

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