OVS SR-IOV configurations

Enable definitions on system level for sr-iov.
diff --git a/neutron/control/openvswitch/sriov.yml b/neutron/control/openvswitch/sriov.yml
new file mode 100644
index 0000000..38f5d29
--- /dev/null
+++ b/neutron/control/openvswitch/sriov.yml
@@ -0,0 +1,7 @@
+parameters:
+  neutron:
+    server:
+      backend:
+        mechanism:
+          sriov:
+            driver: sriovnicswitch