Use buck for tests

- use buck instead of maven
- cleanup output when building cluster.json file
- swap the correct nodes in swap nodes test

(cherry picked from commit 4b66b32e5057d84175195a9c5a823e59cb66fa67)

Change-Id: If5981567115fd3acdc353f4a2ee620f5e0a29716
diff --git a/TestON/tests/USECASE/USECASE_SdnipFunctionCluster/USECASE_SdnipFunctionCluster.py b/TestON/tests/USECASE/USECASE_SdnipFunctionCluster/USECASE_SdnipFunctionCluster.py
index bb8acb8..4ac9b6b 100644
--- a/TestON/tests/USECASE/USECASE_SdnipFunctionCluster/USECASE_SdnipFunctionCluster.py
+++ b/TestON/tests/USECASE/USECASE_SdnipFunctionCluster/USECASE_SdnipFunctionCluster.py
@@ -120,7 +120,7 @@
         main.ONOSbench.getVersion( report=True )
 
         main.step( "Creating ONOS package" )
-        packageResult = main.ONOSbench.onosPackage( opTimeout=500 )
+        packageResult = main.ONOSbench.buckBuild()
         utilities.assert_equals( expect=main.TRUE,
                                  actual=packageResult,
                                  onpass="Package ONOS succeeded",