Remove py2 code for file.seek
Remove py2 code for file.seek

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