[manila-csi-plugin, cinder-csi-plugin]: Allow cluster-id to be populated from configmap / secret

[1602077]

What this PR does / why we need it:

Adds supports for loading cluster_id from a secret / configmap in cluster. If clusterID is not set then CLUSTER_NAME can be overridden using extraEnv to pull configuration from an external object.

e.g.

# values.yaml
openstack-cinder-csi:
  clusterID: ""
  secret:
    filename: "cloud-config"
  csi:
    plugin:
      extraEnv:
        - name: CLUSTER_NAME
          valueFrom:
            configMapKeyRef:
              name: cluster-info
              key: cluster_uuid

This allows us to maintain a single configuration for manila / cinder for all of our cluster's, whilst ensuring that they correctly have the cluster-id metadata attached to the created shares / volumes for each cluster.

Which issue this PR fixes(if applicable):
fixes #3070

Special notes for reviewers:
None

Release note:

* [cinder-csi-plugin] Allow cluster-id to be populated from configmap / secret.
* [manila-csi-plugin] Allow cluster-id to be populated from configmap / secret.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: 1602077 / name: jack munday (225b7f7, 6370ce2, 857aca3)

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[1602077]

Hey - I've signed the CLA just now as this is my first PR into the kubernetes project. Please do let me know if there's anything else you need from me.

Cheers,
Jack

[gouthampacha]

/ok-to-test