vault 3 node cluster deployment on zcx environment

[Shobhit-IBM]

Vault

• Added document for deploying three node secure cluster inside zCX environment using HA-Proxy load balancer to route traffic.
• Added inside /deploy/run-as-zcx-cluster

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[yhyakuna]

@Shobhit-IBM I created #1479 with editorial changes. I didn't want to create a PR against your forked repo.

[Shobhit-IBM]

Thanks should I close this PR then?

[yhyakuna]

Closing this PR and tracking this with #1479