add Vendor model to select flavor/image at Tenant creation

Change-Id: I98b13d345b773ebaf8aff7f5294ce9bbf17d0960
diff --git a/xos/tosca/custom_types/vsm.yaml b/xos/tosca/custom_types/vsm.yaml
index ff8ef88..a68d6dc 100644
--- a/xos/tosca/custom_types/vsm.yaml
+++ b/xos/tosca/custom_types/vsm.yaml
@@ -92,3 +92,19 @@
                 type: string
                 required: false
                 description: Service specific ID opaque to XOS but meaningful to service
+
+    tosca.nodes.VSMVendor:
+        derived_from: tosca.nodes.Root
+        description: >
+            VSM Vendor
+        capabilities:
+            xos_bas_service_caps
+        properties:
+            name:
+                type: string
+                required: true
+
+    tosca.relationships.VendorOfTenant:
+           derived_from: tosca.relationships.Root
+           valid_target_types: [ tosca.capabilities.xos.VSMTenant ]
+