pod-checkpointer: Update to pod-checkpointer image that fixes #432

- Fixes #432.

- pod-checkpointer pod logs errors as it cannot talk to the kubelet api
  as mentioned in the issue.

  This is becuase the pod-checkpointer queries the localhost at 10250 and
  10255 ports to talk to the kubelet API.

  Since in Lokomotive, we run the kubelet as a pod, this causes
  `connection refused` errors as nothing is listening at localhost.

  To rectify the above problem, the solution requires chanves in two
  places:

  1. Provide a way to access the pod's `status.hostIP` as an environment
     variable named `HOST_IP` to use instead of localhost. This is done by
     modifying the daemonset configuration of kubelet.

  2. Change the pod-checkpointer code to use the `HOST_IP` from above.
     This is done in the PR: https://github.com/kinvolk/bootkube/pull/2

- Next we update the image tag to use the new pod-checkpointer image.
  The tag includes the commit id which made this change.

- Lastly we update the generated assets.

Signed-off-by: Imran Pochi <imran@kinvolk.io>

assets/lokomotive-kubernetes/bootkube/resources/charts/pod-checkpointer/templates/daemonset.yaml

@@ -41,6 +41,10 @@ spec:
         - --lock-file=/var/run/lock/pod-checkpointer.lock
         - --kubeconfig=/etc/checkpointer/kubeconfig
         env:
+        - name: HOST_IP
+          valueFrom:
+            fieldRef:
+              fieldPath: status.hostIP
         - name: NODE_NAME
           valueFrom:
             fieldRef:

assets/lokomotive-kubernetes/bootkube/variables.tf

@@ -94,7 +94,7 @@ variable "container_images" {
     calico_controllers      = "calico/kube-controllers:v3.14.1"
     hyperkube               = "k8s.gcr.io/hyperkube:v1.18.3"
     coredns                 = "coredns/coredns:coredns-"
-    pod_checkpointer        = "kinvolk/pod-checkpointer:83e25e5968391b9eb342042c435d1b3eeddb2be1"
+    pod_checkpointer        = "kinvolk/pod-checkpointer:d1c58443fe7d7d33aa5bf7d80d65d299be6e5847"
     kube_apiserver          = "k8s.gcr.io/kube-apiserver:v1.18.3"
     kube_controller_manager = "k8s.gcr.io/kube-controller-manager:v1.18.3"
     kube_scheduler          = "k8s.gcr.io/kube-scheduler:v1.18.3"