Turn target group members into plain lists.
Turn target group members into plain lists.

As the scrape pool deduplicates targets now, it is no longer necessary
to store a hash map for members of each group.

Conorbro/prometheus,Stackdriver/stackdriver-prometheus,Gouthamve/prometheus,SaltedMan/prometheus-annotated,AlekSi/prometheus,ton31337/prometheus,GoogleCloudPlatform/prometheus,prometheus/prometheus,SaltedMan/prometheus-annotated,GoogleCloudPlatform/prometheus,adamron1/prometheus,ton31337/prometheus,JavierZunzunegui/prometheus,yanghongkjxy/prometheus,Conorbro/prometheus,kzittritsch/prometheus,agaoglu/prometheus,prometheus/prometheus,amorken/prometheus,slok/prometheus,Stackdriver/stackdriver-prometheus,prometheus/prometheus,adamron1/prometheus,prometheus/prometheus,tattsun/prometheus,ton31337/prometheus,tomwilkie/prometheus,tattsun/prometheus,AlekSi/prometheus,PrFalken/prometheus,keegancsmith/prometheus,agaoglu/prometheus,datajet-io/prometheus,Stackdriver/stackdriver-prometheus,kangwoo/prometheus,keegancsmith/prometheus,kangwoo/prometheus,PrFalken/prometheus,gottwald/prometheus,Colstuwjx/prometheus,prometheus/prometheus,slok/prometheus,keegancsmith/prometheus,kangwoo/prometheus,SaltedMan/prometheus-annotated,msiebuhr/prometheus,tomwilkie/prometheus,adamron1/prometheus,slok/prometheus,eliothedeman/prometheus,yanghongkjxy/prometheus,adamron1/prometheus,PrFalken/prometheus,alileza/prometheus,JavierZunzunegui/prometheus,SaltedMan/prometheus-annotated,Colstuwjx/prometheus,sudhi-vm/prometheus,amorken/prometheus,kangwoo/prometheus,eliothedeman/prometheus,dsymonds/prometheus,slok/prometheus,brancz/prometheus,alileza/prometheus,dmilstein/prometheus,brancz/prometheus,dmilstein/prometheus,yanghongkjxy/prometheus,kzittritsch/prometheus,dmilstein/prometheus,datajet-io/prometheus,amorken/prometheus,dmilstein/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,alileza/prometheus,dsymonds/prometheus,agaoglu/prometheus,AlekSi/prometheus,Colstuwjx/prometheus,alileza/prometheus,msiebuhr/prometheus,tattsun/prometheus,gottwald/prometheus,datajet-io/prometheus,Gouthamve/prometheus,Colstuwjx/prometheus,JavierZunzunegui/prometheus,sudhi-vm/prometheus,Gouthamve/prometheus,kzittritsch/prometheus,keegancsmith/prometheus,eliothedeman/prometheus,sudhi-vm/prometheus,tomwilkie/prometheus,Gouthamve/prometheus,yanghongkjxy/prometheus,GoogleCloudPlatform/prometheus,Stackdriver/stackdriver-prometheus,gottwald/prometheus,gottwald/prometheus,datajet-io/prometheus,PrFalken/prometheus,agaoglu/prometheus,Conorbro/prometheus,ton31337/prometheus,msiebuhr/prometheus,tomwilkie/prometheus,brancz/prometheus,Conorbro/prometheus,dsymonds/prometheus,eliothedeman/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,tattsun/prometheus,msiebuhr/prometheus,kzittritsch/prometheus,dsymonds/prometheus,amorken/prometheus,AlekSi/prometheus,JavierZunzunegui/prometheus,sudhi-vm/prometheus,brancz/prometheus