new remote cache config for Buck
new remote cache config for Buck

Summary:
this adds the necessary configuration to provide a remote cache for the Buck
repository.

Test Plan: n/a

Reviewed By: shivanker

fbshipit-source-id: fc1bd6d

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