Impact analysis: migration to XML, bug fix for Server <=> Hypervisor

git-svn-id: http://svn.code.sf.net/p/itop/code/trunk@3563 a333f486-631f-4898-b8df-5754b55c2be0

datamodels/2.x/itop-virtualization-mgmt/datamodel.itop-virtualization-mgmt.xml

@@ -901,11 +901,11 @@
         </list>
       </presentation>
     </class>
-    <class id="Server" _delta="merge">
+    <class id="Server">
       <relations>
         <relation id="impacts">
           <neighbours>
-            <neighbour id="hypervisor">
+            <neighbour id="hypervisor" _delta="define">
               <query_down>SELECT Hypervisor AS o WHERE o.server_id = :this-&gt;id</query_down>
               <query_up>SELECT Server AS o WHERE o.id = :this-&gt;server_id</query_up>
             </neighbour>