fix haproxy anchor pre-stop not working

The pre-stop script tries to touch /tmp/stop,
however because of a rofs, fails with permission denied
resulting in the anchor pod getting stuck in Terminating.

This PS adds the mount path /tmp to the anchor container to
resolve the issue.

Change-Id: I3380e4a62b20ae8fdc5da1a72e6794e7cc357218

charts/haproxy/templates/daemonset.yaml

@@ -99,6 +99,8 @@ spec:
               mountPath: /tmp/etc
             - name: host
               mountPath: /host
+            - name: pod-tmp
+              mountPath: /tmp
       volumes:
         - name: haproxy-bin
           configMap: