Issue #2006 Update CentOS and minikube ISO version
Issue #2006 Update CentOS and minikube ISO version

    - CentOS 1.6.0
    - Minikube 0.25.1

LalatenduMohanty/minishift,budhrg/minishift,LalatenduMohanty/minishift,praveenkumar/minishift,jimmidyson/minishift,LalatenduMohanty/minishift,minishift/minishift,jimmidyson/minishift,minishift/minishift,jimmidyson/minishift,minishift/minishift,praveenkumar/minishift,praveenkumar/minishift,budhrg/minishift,budhrg/minishift