Starting to include kafka-integration app as part of Buck build.

- refactored to follow the api & app structure
- added buck files
- builds and loads
- cleaned-up and fixed number of pom files to function as expected
      (meaning "mvn clean install" actually works)

Change-Id: Ib896269c4986f6ee5cd6bae7cf508f71b64f59f9
diff --git a/BUCK b/BUCK
index cc05798..bca18be 100644
--- a/BUCK
+++ b/BUCK
@@ -14,7 +14,7 @@
 
 onos_app (
     title = 'Trellis Troubleshooting Toolkit',
-    category = 'Utilities',
+    category = 'Utility',
     url = 'http://onosproject.org',
     description = 'Provides static analysis of flows and groups ' +
     'to determine the possible paths a packet may take.',