Fix the naming of ipa-dnskeysyncd service principal

https://fedorahosted.org/freeipa/ticket/6405

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipaserver/install/dnskeysyncinstance.py

@@ -50,7 +50,7 @@ class DNSKeySyncInstance(service.Service):
             "ipa-dnskeysyncd",
             service_desc="DNS key synchronization service",
             fstore=fstore,
-            service_prefix=u'ipa-dnskeysync',
+            service_prefix=u'ipa-dnskeysyncd',
             keytab=paths.IPA_DNSKEYSYNCD_KEYTAB
         )
         self.logger = logger