slapos_subscription_request: create Subscription Request as soon as Instance Tree is validated

master/bt5/slapos_subscription_request/PortalTypeWorkflowChainTemplateItem/workflow_chain_type.xml

@@ -7,6 +7,10 @@
   <type>Email</type>
   <workflow>-coordinate_interaction_workflow</workflow>
  </chain>
+ <chain>
+  <type>Instance Tree</type>
+  <workflow>slapos_subscription_request_interaction_workflow</workflow>
+ </chain>
  <chain>
   <type>Subscription Condition</type>
   <workflow>commerce_validation_workflow, edit_workflow</workflow>

master/bt5/slapos_subscription_request/WorkflowTemplateItem/portal_workflow/slapos_subscription_request_interaction_workflow/interaction_ComputeNode_validate.xml

@@ -33,6 +33,7 @@
             <value>
               <tuple>
                 <string>Compute Node</string>
+                <string>Instance Tree</string>
               </tuple>
             </value>
         </item>

master/bt5/slapos_subscription_request/bt/template_portal_type_workflow_chain_list

 Compute Node | slapos_subscription_request_interaction_workflow
 Email | -coordinate_interaction_workflow
+Instance Tree | slapos_subscription_request_interaction_workflow
 Subscription Condition | commerce_validation_workflow
 Subscription Condition | edit_workflow
 Subscription Request | edit_workflow