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/SDNIPperf/SDNIPperf.py b/TestON/tests/USECASE/SDNIPperf/SDNIPperf.py
index 471acfb..7fda683 100644
--- a/TestON/tests/USECASE/SDNIPperf/SDNIPperf.py
+++ b/TestON/tests/USECASE/SDNIPperf/SDNIPperf.py
@@ -50,7 +50,7 @@
         main.ONOSbench.getVersion( report=True )
 
         main.step( "Creating ONOS package" )
-        packageResult = main.ONOSbench.onosPackage( opTimeout=500 )
+        packageResult = main.ONOSbench.buckBuild()
 
         main.step( "Installing ONOS package" )
         onos1InstallResult = main.ONOSbench.onosInstall( options="-f",