schema: domain: Add definition for the 'vmware' private namespace

The 'vmware' private namespace wasn't present in our schema definition
making all XMLs having the <datacenterpath> element invalid.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

docs/schemas/domaincommon.rng

@@ -90,6 +90,9 @@
         <optional>
           <ref name="xencmdline"/>
         </optional>
+        <optional>
+          <ref name="vmwaredatacenterpath"/>
+        </optional>
       </interleave>
     </element>
   </define>
@@ -6835,6 +6838,16 @@
     </element>
   </define>
 
+  <!--
+       Optional hypervisor extensions in their own namespace:
+         vmware
+    -->
+  <define name="vmwaredatacenterpath">
+    <element name="datacenterpath" ns="http://libvirt.org/schemas/domain/vmware/1.0">
+      <text/>
+    </element>
+  </define>
+
   <!--
        Type library
     -->