ONOS-4903, ONOS-4929 Fixed to load network config on application start-up

Also improved openstackInterface to create Jersey client once and
give better warnings. Fixed missing web context, too.

Change-Id: Ifc835b98f30d5daf566eb22dfe3af34f23634e09
diff --git a/apps/openstacknode/src/main/java/org/onosproject/openstacknode/OpenstackNodeManager.java b/apps/openstacknode/src/main/java/org/onosproject/openstacknode/OpenstackNodeManager.java
index fcfcaaa..5ef8045 100644
--- a/apps/openstacknode/src/main/java/org/onosproject/openstacknode/OpenstackNodeManager.java
+++ b/apps/openstacknode/src/main/java/org/onosproject/openstacknode/OpenstackNodeManager.java
@@ -184,6 +184,7 @@
         configRegistry.addListener(configListener);
         componentConfigService.registerProperties(getClass());
 
+        readConfiguration();
         log.info("Started");
     }