Cleanup imports in astrom_manager
Cleanup imports in astrom_manager

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