Update table test_insert to test SkyCoord mixin
Update table test_insert to test SkyCoord mixin

saimn/astropy,mhvk/astropy,pllim/astropy,aleksandr-bakanov/astropy,pllim/astropy,larrybradley/astropy,pllim/astropy,StuartLittlefair/astropy,saimn/astropy,dhomeier/astropy,saimn/astropy,mhvk/astropy,dhomeier/astropy,astropy/astropy,astropy/astropy,mhvk/astropy,pllim/astropy,saimn/astropy,larrybradley/astropy,saimn/astropy,astropy/astropy,StuartLittlefair/astropy,pllim/astropy,dhomeier/astropy,StuartLittlefair/astropy,astropy/astropy,lpsinger/astropy,astropy/astropy,mhvk/astropy,StuartLittlefair/astropy,lpsinger/astropy,lpsinger/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,dhomeier/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,lpsinger/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,mhvk/astropy,lpsinger/astropy