break dependency on hack's config
break dependency on hack's config

Summary: this is the last remaining thing in Flow that depends on hack's `GlobalConfig`.

Reviewed By: gabelevi

Differential Revision: D3532883

fbshipit-source-id: f37832ae0bf9a2273a880922393b5dd79108985c

TiddoLangerak/flow,chenglou/flow,AprilArcus/flow,samwgoldman/flow,TiddoLangerak/flow,gabro/flow,jamesgpearce/flow,jamesgpearce/flow,facebook/flow,AgentME/flow,samwgoldman/flow,JonathanUsername/flow,chenglou/flow,mroch/flow,AprilArcus/flow,MichaelDeBoey/flow,jdelStrother/flow,chenglou/flow,jdelStrother/flow,nmote/flow,jamesgpearce/flow,TiddoLangerak/flow,ForbesLindesay/flow,gabelevi/flow,popham/flow,nmote/flow,popham/flow,facebook/flow,gabro/flow,AgentME/flow,nmote/flow,facebook/flow,popham/flow,claudiopro/flow,popham/flow,ylu1317/flow,facebook/flow,JonathanUsername/flow,jeffmo/flow,jdelStrother/flow,gabelevi/flow,nmote/flow,jamesgpearce/flow,fletcherw/flow,samwgoldman/flow,fletcherw/flow,gabelevi/flow,jeffmo/flow,jgrund/flow,AgentME/flow,fletcherw/flow,ForbesLindesay/flow,mroch/flow,chenglou/flow,MichaelDeBoey/flow,ForbesLindesay/flow,MichaelDeBoey/flow,JonathanUsername/flow,AprilArcus/flow,chenglou/flow,nmote/flow,AprilArcus/flow,samwgoldman/flow,gabelevi/flow,jgrund/flow,nmote/flow,facebook/flow,ylu1317/flow,samwgoldman/flow,AgentME/flow,claudiopro/flow,jdelStrother/flow,mroch/flow,nmote/flow,jeffmo/flow,samwgoldman/flow,JonathanUsername/flow,ylu1317/flow,gabro/flow,jdelStrother/flow,JonathanUsername/flow,jeffmo/flow,fletcherw/flow,AprilArcus/flow,ForbesLindesay/flow,jdelStrother/flow,MichaelDeBoey/flow,jamesgpearce/flow,ForbesLindesay/flow,jgrund/flow,jgrund/flow,facebook/flow,gabelevi/flow,JonathanUsername/flow,gabro/flow,fletcherw/flow,facebook/flow,mroch/flow,jamesgpearce/flow,popham/flow,TiddoLangerak/flow,jeffmo/flow,claudiopro/flow,gabelevi/flow,popham/flow,jgrund/flow,ForbesLindesay/flow,gabro/flow,MichaelDeBoey/flow,TiddoLangerak/flow,mroch/flow,ylu1317/flow,popham/flow,mroch/flow,mroch/flow,samwgoldman/flow,claudiopro/flow,AgentME/flow,fletcherw/flow,jgrund/flow,jamesgpearce/flow,ylu1317/flow,gabelevi/flow,gabro/flow,jeffmo/flow,claudiopro/flow,JonathanUsername/flow,AprilArcus/flow,chenglou/flow