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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1 out of 2 committers have signed the CLA.

• yhyakuna
• Shobhit Dimri

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[hashicorp-cla-app]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

Learn more about why HashiCorp requires a CLA and what the CLA includes

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Shobhit Dimri seems not to be a GitHub user.
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If you have already a GitHub account, please add the email address used for this commit to your account.

_{Have you signed the CLA already but the status is still pending? Recheck it.}

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