ipatests: add missing ssh object classes to idoverrideuser

Reviewed-By: Martin Kosek <mkosek@redhat.com>

ipatests/test_xmlrpc/objectclasses.py

@@ -192,6 +192,8 @@ idoverrideuser = [
     u'ipaOverrideAnchor',
     u'top',
     u'ipaUserOverride',
+    u'ipasshuser',
+    u'ipaSshGroupOfPubKeys'
 ]
 
 idoverridegroup = [