Fixed extraRobotArgs param for voltha-patch-test jobs

Change-Id: Id3fb30eb9f0f1d2c3783a49279e85f2c3102e3a6
diff --git a/jjb/voltha-e2e.yaml b/jjb/voltha-e2e.yaml
index 6ed248f..b6820d6 100755
--- a/jjb/voltha-e2e.yaml
+++ b/jjb/voltha-e2e.yaml
@@ -1172,6 +1172,7 @@
     volthaSystemTestsChange: ''
     volthaHelmChartsChange: ''
     extraHelmFlags: ''
+    robot-args: ''
     branch-regexp: '{all-branches-regexp}'
     testTargets: |
       - target: sanity-kind-att
@@ -1227,6 +1228,11 @@
           description: 'Helm flags to pass to every helm command'
 
       - string:
+          name: extraRobotArgs
+          default: '{robot-args}'
+          description: 'Arguments to pass to robot'
+
+      - string:
           name: volthaSystemTestsChange
           default: '{volthaSystemTestsChange}'
           description: 'Download a change for gerrit in the voltha-system-tests repo, example value: "refs/changes/79/18779/13"'