unsetting voltha1.6 argument to siab builds

Change-Id: I2b18c08910915b714639ae428e6eea74f87af205
diff --git a/jjb/siab-e2e.yaml b/jjb/siab-e2e.yaml
index ee1a810..b5b1935 100644
--- a/jjb/siab-e2e.yaml
+++ b/jjb/siab-e2e.yaml
@@ -52,7 +52,7 @@
 
           cd cord/automation-tools/seba-in-a-box
           [ -e /usr/bin/kubeadm ] && make reset-kubeadm
-          make SEBAVALUES=configs/seba-ponsim-voltha-1.6.yaml && make run-tests
+          make && make run-tests
 
     publishers:
       - email: