In AgentMain, close server socket early
In AgentMain, close server socket early

Summary:
This allows us to move the server socket management fully inside
acceptAuthenticConnectionFromClient.  This is the same thing that the
native agent does.

Test Plan: Exopackage test.

fbshipit-source-id: a4afa5e

SeleniumHQ/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck,romanoid/buck,SeleniumHQ/buck,SeleniumHQ/buck,JoelMarcey/buck,romanoid/buck,shs96c/buck,shs96c/buck,shs96c/buck,Addepar/buck,JoelMarcey/buck,LegNeato/buck,romanoid/buck,SeleniumHQ/buck,Addepar/buck,clonetwin26/buck,zpao/buck,shs96c/buck,kageiit/buck,romanoid/buck,ilya-klyuchnikov/buck,romanoid/buck,brettwooldridge/buck,kageiit/buck,romanoid/buck,LegNeato/buck,Addepar/buck,facebook/buck,clonetwin26/buck,nguyentruongtho/buck,shs96c/buck,kageiit/buck,SeleniumHQ/buck,clonetwin26/buck,zpao/buck,ilya-klyuchnikov/buck,rmaz/buck,brettwooldridge/buck,JoelMarcey/buck,brettwooldridge/buck,clonetwin26/buck,JoelMarcey/buck,rmaz/buck,rmaz/buck,JoelMarcey/buck,romanoid/buck,shs96c/buck,clonetwin26/buck,nguyentruongtho/buck,romanoid/buck,clonetwin26/buck,brettwooldridge/buck,rmaz/buck,facebook/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,Addepar/buck,LegNeato/buck,Addepar/buck,ilya-klyuchnikov/buck,Addepar/buck,LegNeato/buck,LegNeato/buck,rmaz/buck,JoelMarcey/buck,ilya-klyuchnikov/buck,brettwooldridge/buck,facebook/buck,SeleniumHQ/buck,rmaz/buck,zpao/buck,rmaz/buck,romanoid/buck,romanoid/buck,Addepar/buck,LegNeato/buck,brettwooldridge/buck,ilya-klyuchnikov/buck,kageiit/buck,nguyentruongtho/buck,ilya-klyuchnikov/buck,SeleniumHQ/buck,clonetwin26/buck,brettwooldridge/buck,clonetwin26/buck,nguyentruongtho/buck,rmaz/buck,JoelMarcey/buck,SeleniumHQ/buck,JoelMarcey/buck,nguyentruongtho/buck,clonetwin26/buck,brettwooldridge/buck,facebook/buck,SeleniumHQ/buck,rmaz/buck,shs96c/buck,shs96c/buck,romanoid/buck,zpao/buck,ilya-klyuchnikov/buck,zpao/buck,SeleniumHQ/buck,JoelMarcey/buck,brettwooldridge/buck,JoelMarcey/buck,facebook/buck,kageiit/buck,Addepar/buck,Addepar/buck,romanoid/buck,shs96c/buck,brettwooldridge/buck,SeleniumHQ/buck,LegNeato/buck,rmaz/buck,shs96c/buck,kageiit/buck,Addepar/buck,clonetwin26/buck,shs96c/buck,SeleniumHQ/buck,LegNeato/buck,brettwooldridge/buck,romanoid/buck,brettwooldridge/buck,rmaz/buck,LegNeato/buck,shs96c/buck,nguyentruongtho/buck,JoelMarcey/buck,LegNeato/buck,Addepar/buck,rmaz/buck,zpao/buck,LegNeato/buck,SeleniumHQ/buck,kageiit/buck,clonetwin26/buck,shs96c/buck,rmaz/buck,clonetwin26/buck,JoelMarcey/buck,zpao/buck,facebook/buck,LegNeato/buck,ilya-klyuchnikov/buck,nguyentruongtho/buck,clonetwin26/buck,facebook/buck,Addepar/buck,Addepar/buck,LegNeato/buck,JoelMarcey/buck,ilya-klyuchnikov/buck,ilya-klyuchnikov/buck