update-report: allow skipping analytics message.
update-report: allow skipping analytics message.

This is used by the install script so it can simplify it's logic and
make the analytics messaging more prominent.

mahori/brew,mgrimes/brew,hanxue/linuxbrew,DomT4/brew,sjackman/homebrew,alyssais/brew,mahori/brew,palxex/brew,nandub/brew,sjackman/homebrew,claui/brew,alyssais/brew,claui/brew,aw1621107/brew,jmsundar/brew,DomT4/brew,maxim-belkin/brew,vitorgalvao/brew,bfontaine/brew,rwhogg/brew,reelsense/brew,gregory-nisbet/brew,ilovezfs/brew,hanxue/linuxbrew,aw1621107/brew,reitermarkus/brew,JCount/brew,nandub/brew,muellermartin/dist,pseudocody/brew,EricFromCanada/brew,mahori/brew,pseudocody/brew,tonyg/homebrew,ilovezfs/brew,maxim-belkin/brew,ilovezfs/brew,palxex/brew,claui/brew,alyssais/brew,EricFromCanada/brew,Linuxbrew/brew,mgrimes/brew,jmsundar/brew,reitermarkus/brew,amar-laksh/brew_sudo,zmwangx/brew,gregory-nisbet/brew,bfontaine/brew,muellermartin/dist,mgrimes/brew,EricFromCanada/brew,JCount/brew,sjackman/homebrew,nandub/brew,reitermarkus/brew,vitorgalvao/brew,Linuxbrew/brew,gregory-nisbet/brew,sjackman/homebrew,DomT4/brew,MikeMcQuaid/brew,DomT4/brew,mahori/brew,MikeMcQuaid/brew,zmwangx/brew,amar-laksh/brew_sudo,maxim-belkin/brew,nandub/brew,MikeMcQuaid/brew,tonyg/homebrew,bfontaine/brew,MikeMcQuaid/brew,palxex/brew,rwhogg/brew,tonyg/homebrew,muellermartin/dist,Homebrew/brew,Homebrew/brew,hanxue/linuxbrew,konqui/brew,JCount/brew,reitermarkus/brew,amar-laksh/brew_sudo,reelsense/brew,claui/brew,Linuxbrew/brew,Homebrew/brew,JCount/brew,rwhogg/brew,jmsundar/brew,reelsense/brew,vitorgalvao/brew,pseudocody/brew,Homebrew/brew,EricFromCanada/brew,konqui/brew,aw1621107/brew,zmwangx/brew,vitorgalvao/brew,konqui/brew,Linuxbrew/brew,konqui/brew