WIP: e2e: use upstream volume testsuites package

The entire volume testing has been refactored upstream. Instead of
just one provisioning test for CSI, the full range of tests that were
previously only available for in-tree volume drivers can now also be
used for CSI.

With some pending
modifications (kubernetes/kubernetes#70862)
these tests can also be used out-of-tree and replace the locally
modified copy of the provisioning test.

The downside is the long runtime.

Gopkg.toml

@@ -64,38 +64,39 @@ ignored = [
 
 [[constraint]]
   name = "k8s.io/kubernetes"
-  version = "1.13.1"
+  branch = "storage-volume-testsuites-concurrency"
+  source = "github.com/pohly/kubernetes"
 
 [[override]]
   name = "k8s.io/apimachinery"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/api"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/apiserver"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/apiextensions-apiserver"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/cli-runtime"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/client-go"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/cloud-provider"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/cluster-bootstrap"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/csi-api"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 [[override]]
   name = "k8s.io/kube-aggregator"
-  version = "kubernetes-1.13.1"
+  branch = "master"
 
 # Doesn't do proper releases.
 [[override]]