Support several vlan ranges per physnet

Handle several vlan ranges of one physnet properly

Change-Id: I42dce60a276f22357837fb5c9248c0693fc529cf
Related-Prod: (PROD-25082)
diff --git a/README.rst b/README.rst
index 00a74c4..1d03977 100644
--- a/README.rst
+++ b/README.rst
@@ -743,7 +743,7 @@
                 - flat # possible values - 'flat' or 'vlan'
             sriov_net:
               mtu: 9000 # Optional, defaults to 1500
-              vlan_range: '100:200' # Optional
+              vlan_range: '100:200,300:400' # Optional
               types:
                 - vlan
             ext_net2: