WIP - updates Azure Terraform example files to allow users to create a cluster within an internal network only

[mihiragrawal]

What this PR does / why we need it:

This PR updates Azure Terraform example files to allow users to create a cluster within an internal network.
Current Terraform example configs for Azure create public IPs for LB and VMs. However, due to Azure's internal LB hairpin issue, cluster creation failed. Many customers want to create clusters in their internal network.

Which issue(s) this PR fixes:

Fixes #

What type of PR is this?

/kind documentation

Special notes for your reviewer:

Does this PR introduce a user-facing change? Then add your Release Note here:

Updates Azure Terraform example files to allow users to create a cluster within an internal network only

Documentation:

[kubermatic-bot]

@mihiragrawal: Adding the "do-not-merge/docs-needed" label because no documentation block was detected, please follow our documentation process to remove it.

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[kubermatic-bot]

Skipping CI for Draft Pull Request.
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The list of commits missing DCO signoff:

• 8d2b63e update terraform example files to have an option for internal network only

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