tests: delete HOMEBREW_INSTALL_CLEANUP for test consistency.
tests: delete HOMEBREW_INSTALL_CLEANUP for test consistency.

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