hbc/installer: don't send analytics for private taps.
hbc/installer: don't send analytics for private taps.

reitermarkus/brew,vitorgalvao/brew,reitermarkus/brew,JCount/brew,sjackman/homebrew,Linuxbrew/brew,claui/brew,sjackman/homebrew,DomT4/brew,reitermarkus/brew,reitermarkus/brew,Linuxbrew/brew,konqui/brew,MikeMcQuaid/brew,maxim-belkin/brew,JCount/brew,Homebrew/brew,EricFromCanada/brew,nandub/brew,JCount/brew,Linuxbrew/brew,vitorgalvao/brew,nandub/brew,Homebrew/brew,EricFromCanada/brew,EricFromCanada/brew,mahori/brew,Homebrew/brew,MikeMcQuaid/brew,konqui/brew,MikeMcQuaid/brew,mahori/brew,sjackman/homebrew,DomT4/brew,mahori/brew,maxim-belkin/brew,claui/brew,DomT4/brew,JCount/brew,claui/brew,MikeMcQuaid/brew,maxim-belkin/brew,claui/brew,Linuxbrew/brew,Homebrew/brew,sjackman/homebrew,vitorgalvao/brew,nandub/brew,nandub/brew,konqui/brew,mahori/brew,konqui/brew,vitorgalvao/brew,EricFromCanada/brew,DomT4/brew