Correct space between helm flags parameters

Change-Id: Ic4fbea0da5a9138e6d28ad6b2b1688891d304f26
diff --git a/jjb/voltha-e2e.yaml b/jjb/voltha-e2e.yaml
index edd3412..85e88b2 100755
--- a/jjb/voltha-e2e.yaml
+++ b/jjb/voltha-e2e.yaml
@@ -612,7 +612,7 @@
 
       - string:
           name: extraHelmFlags
-          default: '--set onu={onus},pon={pons},{extraHelmFlags}'
+          default: '--set onu={onus},pon={pons} {extraHelmFlags}'
           description: 'Helm flags to pass to ./voltha up'
 
       - bool: