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/SCPF/SCPFintentEventTp/SCPFintentEventTp.py b/TestON/tests/SCPF/SCPFintentEventTp/SCPFintentEventTp.py
index 6b333bc..04d99c4 100644
--- a/TestON/tests/SCPF/SCPFintentEventTp/SCPFintentEventTp.py
+++ b/TestON/tests/SCPF/SCPFintentEventTp/SCPFintentEventTp.py
@@ -139,7 +139,7 @@
                                 onfail="Failed to apply cell to environment ")
 
         main.step( "Creating ONOS package" )
-        packageResult = main.ONOSbench.onosPackage()
+        packageResult = main.ONOSbench.buckBuild()
         stepResult = packageResult
         utilities.assert_equals(expect=main.TRUE,
                                 actual=stepResult,