Disable global forwarding per-zone

bind-dyndb-ldap allows disabling global forwarder per-zone. This may
be useful in a scenario when we do not want requests to delegated
sub-zones (like sub.example.com. in zone example.com.) to be routed
through global forwarder.

Few lines to help added to explain the feature to users too.

https://fedorahosted.org/freeipa/ticket/3209

VERSION

@@ -79,4 +79,4 @@ IPA_DATA_VERSION=20100614120000
 #                                                      #
 ########################################################
 IPA_API_VERSION_MAJOR=2
-IPA_API_VERSION_MINOR=45
+IPA_API_VERSION_MINOR=46