Use mod_auth_gssapi instead of mod_auth_kerb
    
    Change configuration on new installs only.
    
    Enable GssapiLocalName so we have access to the local name in
    REMOTE_USER and the full principle in GSS_NAME.
    
    Enable GssapiSSLonly even though SSLRequireSSL is also set.
    The belt and suspenders principla.
    
    https://fedorahosted.org/ipsilon/ticket/89
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-by: Simo Sorce <simo@redhat.com>