Add managedby to Host entries

This will allow others to provision on behalf of the host.

ticket 280

tests/test_xmlrpc/test_netgroup_plugin.py

@@ -164,6 +164,7 @@ class test_netgroup(Declarative):
                     krbprincipalname=[u'host/%s@%s' % (host1, api.env.realm)],
                     objectclass=objectclasses.host,
                     ipauniqueid=[fuzzy_uuid],
+                    managedby_host=[host1],
                 ),
             ),
         ),