Add regression tests that t.info() does not emit warnings.
Add regression tests that t.info() does not emit warnings.

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