Do not set global erfa_astrom in doctest
Do not set global erfa_astrom in doctest

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