Enable/Disable dashboards-cm installation and add Jiva volume dashboard

[rajaSahil]

Signed-off-by: Sahil Raja sahil.raja@mayadata.io

What this PR does?

• Enable/Disable dashboards-cm installation.
• Label to distinguish between cstor and JIva volume as discussed.

  
  cStor: - sourceLabels: [__meta_kubernetes_pod_label_app]
       action: replace
       targetLabel: openebs_cstor_label

Jiva: - sourceLabels: [__meta_kubernetes_pod_label_openebs_io_controller] action: replace targetLabel: openebs_jiva_label

- Add Jiva volume dashboard
![Screenshot from 2021-05-26 17-36-22](https://user-images.githubusercontent.com/32039199/119656967-f9a20600-be48-11eb-9f55-9e657af6c784.png)
![Screenshot from 2021-05-26 17-36-34](https://user-images.githubusercontent.com/32039199/119656978-fb6bc980-be48-11eb-990c-d8a9c834eaa4.png)