exceptions: remove unused scp exception.
exceptions: remove unused scp exception.

The code was removed but the exception was not.

JCount/brew,sjackman/homebrew,nandub/brew,mahori/brew,sjackman/homebrew,vitorgalvao/brew,reitermarkus/brew,claui/brew,claui/brew,EricFromCanada/brew,nandub/brew,konqui/brew,JCount/brew,reitermarkus/brew,Homebrew/brew,reitermarkus/brew,Homebrew/brew,vitorgalvao/brew,sjackman/homebrew,MikeMcQuaid/brew,konqui/brew,JCount/brew,nandub/brew,mahori/brew,claui/brew,reitermarkus/brew,vitorgalvao/brew,sjackman/homebrew,konqui/brew,Homebrew/brew,EricFromCanada/brew,EricFromCanada/brew,MikeMcQuaid/brew,konqui/brew,claui/brew,EricFromCanada/brew,JCount/brew,MikeMcQuaid/brew,mahori/brew,Homebrew/brew,vitorgalvao/brew,nandub/brew,MikeMcQuaid/brew,mahori/brew