fix bin_dir

contrib/network-storage/heketi/roles/provision/tasks/storage.yml

@@ -7,5 +7,6 @@
 - name: "Kubernetes Apps | Install and configure Heketi Storage"
   kube:
     name: "GlusterFS"
+    kubectl: "{{bin_dir}}/kubectl"
     filename: "{{ kube_config_dir }}/heketi-storage.json"
     state: "{{ rendering.changed | ternary('latest', 'present') }}"