adds kfctl E2E test (kubeflow#139)

run on presubmit instead of postsubmit

adds workflow for kfctl go test

adds util.libsonnet

adds workflow libsonnet from kubeflow/kubeflow

adds kfctl go test to params.libsonnet

minor fix

git fetch kubeflow/kubeflow

set version to master for workflow

Author: swiftdiaries

.gitignore

@@ -1,3 +1,5 @@
 *.idea
 go.mod
 go.sum
+.vscode
+.DS_Store

prow_config.yaml

@@ -6,3 +6,15 @@ workflows:
     name: e2e
     job_types:
       - presubmit
+  # Run kfctl E2E
+  - app_dir: kubeflow/manifests/tests/workflows
+    component: kfctl_go_test
+    name: kfctl-go
+    job_types:
+      - presubmit
+    params:
+      platform: gke
+      gkeApiVersion: v1
+      workflowName: kfctl-go
+      useIstio: true
+      version: master