Disable pull stat in arc land
Disable pull stat in arc land

Test Plan:
  $ git pull --no-stat

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4754

alexmv/arcanist,haskell-infra/arcanist,calblueprint/arcanist,memsql/arcanist,uber/arcanist,kevinseelbach/arcanist,zhihu/arcanist,codelabs-ch/arcanist,alexmv/arcanist,wxstars/arcanist,phacility/arcanist,coursera/arcanist,hach-que/arcanist,wxstars/arcanist,dguo-coursera/arcanist,eSpark/arcanist,PageUpPeopleOrg/arcanist-patches,sneakpeeq/arcanist,r4nt/arcanist,r4nt/arcanist,folsom-labs/arcanist,Khan/arcanist,wikimedia/phabricator-arcanist,eSpark/arcanist,kevinseelbach/arcanist,uber/arcanist,wikimedia/phabricator-arcanist,zhihu/arcanist,dguo-coursera/arcanist,haskell-infra/arcanist,hach-que/arcanist,julkiewicz/arcanist,dguo-coursera/arcanist,uber/arcanist,codelabs-ch/arcanist,calblueprint/arcanist,wharris/arcanist,phacility/arcanist,phacility/arcanist,coursera/arcanist,phacility/arcanist,haskell-infra/arcanist,KieranHayes/arcanist,sneakpeeq/arcanist,coursera/arcanist,kevinseelbach/arcanist,Khan/arcanist,r4nt/arcanist,codelabs-ch/arcanist,julkiewicz/arcanist,julkiewicz/arcanist,Symplicity/arcanist,eSpark/arcanist,Symplicity/arcanist,Symplicity/arcanist,wxstars/arcanist,PageUpPeopleOrg/arcanist-patches,codelabs-ch/arcanist,uber/arcanist,haskell-infra/arcanist,fivestars/arcanist,folsom-labs/arcanist,wharris/arcanist,aik099/arcanist,calblueprint/arcanist,calblueprint/arcanist,KieranHayes/arcanist,fivestars/arcanist,memsql/arcanist,memsql/arcanist,wharris/arcanist,Khan/arcanist,folsom-labs/arcanist,wikimedia/phabricator-arcanist,alexmv/arcanist,chundongwang/arcanist,wharris/arcanist,PageUpPeopleOrg/arcanist-patches,aik099/arcanist,sneakpeeq/arcanist,Khan/arcanist,coursera/arcanist,phacility/arcanist,Symplicity/arcanist,dguo-coursera/arcanist,KieranHayes/arcanist,wikimedia/phabricator-arcanist,jra3/arcanist,alexmv/arcanist,sneakpeeq/arcanist,chundongwang/arcanist,KieranHayes/arcanist,fivestars/arcanist,aik099/arcanist,fivestars/arcanist,julkiewicz/arcanist,jra3/arcanist,zhihu/arcanist,folsom-labs/arcanist,codelabs-ch/arcanist,chundongwang/arcanist,PageUpPeopleOrg/arcanist-patches,eSpark/arcanist,r4nt/arcanist,kevinseelbach/arcanist,chundongwang/arcanist,hach-que/arcanist,aik099/arcanist,hach-que/arcanist,memsql/arcanist,wxstars/arcanist,jra3/arcanist,jra3/arcanist,zhihu/arcanist