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/FUNC/FUNCovsdbtest/FUNCovsdbtest.py b/TestON/tests/FUNC/FUNCovsdbtest/FUNCovsdbtest.py
index f71d921..82274d0 100644
--- a/TestON/tests/FUNC/FUNCovsdbtest/FUNCovsdbtest.py
+++ b/TestON/tests/FUNC/FUNCovsdbtest/FUNCovsdbtest.py
@@ -117,7 +117,7 @@
                                  onfail="MCI failed" )
 
         main.step( "Creating ONOS package" )
-        packageResult = main.ONOSbench.onosPackage()
+        packageResult = main.ONOSbench.buckBuild()
         utilities.assert_equals( expect=main.TRUE,
                                      actual=packageResult,
                                      onpass="Successfully created ONOS package",