topology: Fix: Make sure the old 'realm' topology suffix is not used

The old 'realm' topology suffix is no longer used, howver, it was being
created on masters with version 4.2.3 and later. Make sure it's properly
removed.

Note that this is not the case for the 'ipaca' suffix, whic was later
removed to 'ca'.

https://fedorahosted.org/freeipa/ticket/5526

Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>

install/updates/20-replication.update

@@ -32,6 +32,7 @@ add: nsDS5ReplicatedAttributeListTotal: $TOTAL_EXCLUDES
 add: nsds5ReplicaStripAttrs: $STRIP_ATTRS
 
 # Remove old topology configuration area (unused)
+dn: cn=realm,cn=topology,cn=ipa,cn=etc,$SUFFIX
 deleteentry: cn=realm,cn=topology,cn=ipa,cn=etc,$SUFFIX
 
 # add IPA realm managed suffix to master entry