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/openstacknetworking/web/BUCK b/apps/openstacknetworking/web/BUCK
index ac7ba09..6ef1f93 100644
--- a/apps/openstacknetworking/web/BUCK
+++ b/apps/openstacknetworking/web/BUCK
@@ -10,4 +10,5 @@
 
 osgi_jar_with_tests (
     deps = COMPILE_DEPS,
+    web_context = '/onos/openstackswitching'
 )