cmd/pull: add retry to curl bottle download (#232)
cmd/pull: add retry to curl bottle download (#232)

Works around issue with GET and HEAD apparently acting differently, and
bottle downloads failing even after successful polling completion.
muellermartin/dist,sjackman/homebrew,EricFromCanada/brew,mahori/brew,JCount/brew,pseudocody/brew,reitermarkus/brew,maxim-belkin/brew,sjackman/homebrew,maxim-belkin/brew,claui/brew,hanxue/linuxbrew,pseudocody/brew,gordonmcshane/homebrew,Linuxbrew/brew,JCount/brew,aw1621107/brew,nandub/brew,MikeMcQuaid/brew,AnastasiaSulyagina/brew,reitermarkus/brew,reitermarkus/brew,palxex/brew,hanxue/linuxbrew,MikeMcQuaid/brew,bfontaine/brew,sjackman/homebrew,ilovezfs/brew,mahori/brew,DomT4/brew,Linuxbrew/brew,EricFromCanada/brew,aw1621107/brew,mahori/brew,nandub/brew,jmsundar/brew,JCount/brew,gordonmcshane/homebrew,mahori/brew,konqui/brew,konqui/brew,tonyg/homebrew,ilovezfs/brew,pseudocody/brew,mgrimes/brew,gordonmcshane/homebrew,EricFromCanada/brew,nandub/brew,muellermartin/dist,bfontaine/brew,palxex/brew,jmsundar/brew,Homebrew/brew,gregory-nisbet/brew,DomT4/brew,DomT4/brew,claui/brew,sjackman/homebrew,reelsense/brew,JCount/brew,rwhogg/brew,DomT4/brew,toonetown/homebrew,staticfloat/brew,hanxue/linuxbrew,Linuxbrew/brew,amar-laksh/brew_sudo,muellermartin/dist,amar-laksh/brew_sudo,claui/brew,amar-laksh/brew_sudo,gregory-nisbet/brew,konqui/brew,vitorgalvao/brew,zmwangx/brew,rwhogg/brew,tonyg/homebrew,reelsense/brew,zmwangx/brew,bfontaine/brew,MikeMcQuaid/brew,staticfloat/brew,reitermarkus/brew,staticfloat/brew,mgrimes/brew,claui/brew,tonyg/homebrew,Homebrew/brew,aw1621107/brew,MikeMcQuaid/brew,maxim-belkin/brew,EricFromCanada/brew,zmwangx/brew,AnastasiaSulyagina/brew,gregory-nisbet/brew,Linuxbrew/brew,ilovezfs/brew,nandub/brew,Homebrew/brew,alyssais/brew,jmsundar/brew,reelsense/brew,Homebrew/brew,vitorgalvao/brew,toonetown/homebrew,AnastasiaSulyagina/brew,vitorgalvao/brew,alyssais/brew,alyssais/brew,rwhogg/brew,konqui/brew,palxex/brew,toonetown/homebrew,mgrimes/brew,vitorgalvao/brew