Fix a newline issue in "arc" workflows
Fix a newline issue in "arc" workflows

Summary:
We end up with one too few newline here in some workflows, like `arc land` with unstaged changes.

Root issue here is that `phutil_console_prompt|confirm` lead with too much whitespace but that's a harder fix.

Test Plan: Saw reasonable whitespace.

Reviewers: btrahan, chad

Reviewed By: chad

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D11927

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