slapos_subscription_request: Subscription Request is a ticket like Credential Request

master/bt5/slapos_subscription_request/PortalTypeTemplateItem/portal_types/Subscription%20Request.xml

@@ -26,7 +26,7 @@
             <key> <string>group_list</string> </key>
             <value>
               <tuple>
-                <string>item</string>
+                <string>ticket</string>
               </tuple>
             </value>
         </item>
@@ -50,7 +50,7 @@
         </item>
         <item>
             <key> <string>type_class</string> </key>
-            <value> <string>XMLObject</string> </value>
+            <value> <string>CredentialRequest</string> </value>
         </item>
         <item>
             <key> <string>type_interface</string> </key>