[ONOS-6593]Review and Refactor ONOS startup procedures in TestON

Change-Id: I509a8ee7a26c198957bebf59da5c85a0edb8b995
diff --git a/TestON/tests/USECASE/VPLS/VPLSBasic/VPLSBasic.topo b/TestON/tests/USECASE/VPLS/VPLSBasic/VPLSBasic.topo
index 476d986..03e451b 100755
--- a/TestON/tests/USECASE/VPLS/VPLSBasic/VPLSBasic.topo
+++ b/TestON/tests/USECASE/VPLS/VPLSBasic/VPLSBasic.topo
@@ -8,7 +8,7 @@
             <type>OnosDriver</type>
             <connect_order>1</connect_order>
             <COMPONENTS>
-                <nodes>1</nodes>
+                <nodes>3</nodes>
                 <prompt></prompt>
             </COMPONENTS>
         </ONOSbench>