Change the Requires for the server and server-selinux for proper order
    
    The server package needs to be installed before the server-selinux
    package otherwise the SELinux contexts won't get set properly.
    
    The (postun) is so you can continue to do yum erase freeipa-python
    and it will pick up everything else.
    
    https://fedorahosted.org/freeipa/ticket/1779