Make ipa-server-install clean after itself
    
    ipa-server-install may create some files in the first phase of
    installation before the actual installation and configuring of
    services starts. If the installation is interrupted, these files
    may prevent installing the server again until IPA server is
    uninstalled. This may be confusing and annoying for the user.
    
    This patch safely recovers all known files that could be created
    in the first phase of the installation. No clean up is done if
    the actual installation has not started yet or the installation
    returned success.
    
    https://fedorahosted.org/freeipa/ticket/1980