bump required version of BIND, bind-dyndb-ldap
    
    bynd-dyndb-ldap used a custom configuration file format. Since BIND 9.11,
    an API was accepted upstream. This caused backward incompatible changes
    to the named.conf configuration file used to configure the
    bind-dyndb-ldap BIND plugin. Version 11.0 of bind-dyndb-ldap plugin and
    BIND 9.11 are required to use with the new config file format.
    
    https://fedorahosted.org/freeipa/ticket/6565
    
    Reviewed-By: Martin Basti <mbasti@redhat.com>