DNS Locations: Always create DNS related privileges
    
    DNS privileges are important for handling DNS locations which can be
    created without DNS servers in IPA topology. We will also need this
    privileges presented for future feature 'External DNS support'
    
    https://fedorahosted.org/freeipa/ticket/2008
    
    Reviewed-By: Petr Spacek <pspacek@redhat.com>
    Reviewed-By: Jan Cholasta <jcholast@redhat.com>