Pass through current agent Consul datacenter name
Pass through current agent Consul datacenter name

Instead of only filling __meta_consul_dc when datacenter is set in
consul_sd_config this change fills the label based on what the agent
reports it's current data center is, if datacenter isn't manually set,
otherwise it uses whatever datacenter was set to.

dpatel06/prometheus,keegancsmith/prometheus,Colstuwjx/prometheus,mtanda/prometheus,dln/prometheus,mtanda/prometheus,GoogleCloudPlatform/prometheus,dsymonds/prometheus,jimmidyson/prometheus,ton31337/prometheus,tattsun/prometheus,Dieterbe/prometheus,datajet-io/prometheus,adamron1/prometheus,dsymonds/prometheus,msiebuhr/prometheus,agaoglu/prometheus,amorken/prometheus,prometheus/prometheus,yanghongkjxy/prometheus,PrFalken/prometheus,AlekSi/prometheus,Colstuwjx/prometheus,RobertKielty/prometheus,trigrass2/prometheus,tomwilkie/prometheus,dalanlan/prometheus,AlekSi/prometheus,dmilstein/prometheus,ton31337/prometheus,GoogleCloudPlatform/prometheus,Conorbro/prometheus,nicr9/prometheus,tomwilkie/prometheus,laushinka/prometheus,dsymonds/prometheus,msiebuhr/prometheus,dln/prometheus,brancz/prometheus,datajet-io/prometheus,wrouesnel/prometheus,sudhi-vm/prometheus,thachmai/prometheus,slok/prometheus,cit-lab/prometheus,GoogleCloudPlatform/prometheus,laushinka/prometheus,gcnonato/prometheus,RobertKielty/prometheus,PrFalken/prometheus,kzittritsch/prometheus,datajet-io/prometheus,yanghongkjxy/prometheus,Dieterbe/prometheus,ton31337/prometheus,gcnonato/prometheus,GoogleCloudPlatform/prometheus,AlekSi/prometheus,JavierZunzunegui/prometheus,kzittritsch/prometheus,iksaif/prometheus,Gouthamve/prometheus,dalanlan/prometheus,trigrass2/prometheus,PrFalken/prometheus,Gouthamve/prometheus,kzittritsch/prometheus,alileza/prometheus,dmilstein/prometheus,msiebuhr/prometheus,JavierZunzunegui/prometheus,prometheus/prometheus,agaoglu/prometheus,tomwilkie/prometheus,trigrass2/prometheus,keegancsmith/prometheus,mtanda/prometheus,flier/prometheus,amorken/prometheus,dmilstein/prometheus,adamron1/prometheus,datajet-io/prometheus,keegancsmith/prometheus,tomwilkie/prometheus,jbdalido/prometheus,nicr9/prometheus,mtanda/prometheus,wrouesnel/prometheus,eliothedeman/prometheus,sudhi-vm/prometheus,Stackdriver/stackdriver-prometheus,RobertKielty/prometheus,iksaif/prometheus,dln/prometheus,dpatel06/prometheus,dmilstein/prometheus,wndhydrnt/prometheus,gcnonato/prometheus,brancz/prometheus,GoogleCloudPlatform/prometheus,gottwald/prometheus,SaltedMan/prometheus-annotated,kangwoo/prometheus,yanghongkjxy/prometheus,alileza/prometheus,eliothedeman/prometheus,thachmai/prometheus,nicr9/prometheus,slok/prometheus,brancz/prometheus,dpatel06/prometheus,alileza/prometheus,prometheus/prometheus,prometheus/prometheus,mrwacky42/prometheus,Stackdriver/stackdriver-prometheus,cit-lab/prometheus,prometheus/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,slok/prometheus,kangwoo/prometheus,wndhydrnt/prometheus,agaoglu/prometheus,AlekSi/prometheus,flier/prometheus,tattsun/prometheus,jbdalido/prometheus,alileza/prometheus,wrouesnel/prometheus,adamron1/prometheus,dln/prometheus,ton31337/prometheus,thachmai/prometheus,wrouesnel/prometheus,SaltedMan/prometheus-annotated,Stackdriver/stackdriver-prometheus,Conorbro/prometheus,amorken/prometheus,msiebuhr/prometheus,Gouthamve/prometheus,cit-lab/prometheus,mrwacky42/prometheus,PrFalken/prometheus,sudhi-vm/prometheus,iksaif/prometheus,jimmidyson/prometheus,laushinka/prometheus,RobertKielty/prometheus,kzittritsch/prometheus,Conorbro/prometheus,iksaif/prometheus,Colstuwjx/prometheus,eliothedeman/prometheus,amorken/prometheus,wndhydrnt/prometheus,thachmai/prometheus,wxdublin/prometheus,SaltedMan/prometheus-annotated,gottwald/prometheus,kangwoo/prometheus,tattsun/prometheus,dsymonds/prometheus,SaltedMan/prometheus-annotated,mrwacky42/prometheus,Dieterbe/prometheus,brancz/prometheus,dalanlan/prometheus,jbdalido/prometheus,gottwald/prometheus,jbdalido/prometheus,Conorbro/prometheus,JavierZunzunegui/prometheus,eliothedeman/prometheus,tattsun/prometheus,trigrass2/prometheus,cit-lab/prometheus,adamron1/prometheus,wxdublin/prometheus,Colstuwjx/prometheus,gottwald/prometheus,kangwoo/prometheus,agaoglu/prometheus,yanghongkjxy/prometheus,sudhi-vm/prometheus,Stackdriver/stackdriver-prometheus,wxdublin/prometheus,alileza/prometheus,gcnonato/prometheus,flier/prometheus,laushinka/prometheus,slok/prometheus,JavierZunzunegui/prometheus,Gouthamve/prometheus,jimmidyson/prometheus