0a1dad2 Forbid reinstallation in ipa-client-install

Authored and Committed by mkosek 12 years ago
    Forbid reinstallation in ipa-client-install
    
    The --force option may be misused to reinstall an existing IPA
    client. This is not supported and may lead to unexpected errors.
    When required, the cleanest way to re-install IPA client is to
    run uninstall and then install again.
    
    This patch also includes few cosmetic changes in messages to user
    to provide more consistent user experience with the script.
    
    https://fedorahosted.org/freeipa/ticket/1117