DNSSEC: DNS key synchronization daemon

Tickets:
https://fedorahosted.org/freeipa/ticket/3801
https://fedorahosted.org/freeipa/ticket/4417

Design:
https://fedorahosted.org/bind-dyndb-ldap/wiki/BIND9/Design/DNSSEC

Reviewed-By: Jan Cholasta <jcholast@redhat.com>
Reviewed-By: David Kupka <dkupka@redhat.com>

ipapython/dnsutil.py

@@ -62,6 +62,9 @@ class DNSName(dns.name.Name):
         #method named by RFC 3490 and python standard library
         return str(self).decode('ascii')  # must be unicode string
 
+    def canonicalize(self):
+        return DNSName(super(DNSName, self).canonicalize())
+
     def concatenate(self, other):
         return DNSName(super(DNSName, self).concatenate(other))