Create additional output in LZ virtualnetwork submodule to enable referring to VNET names in configuration

[TYYBG]

Overview/summary

Additional output in both virtualnetwork and main module will make it possible to refer to VNETs created in lz_vending module by name. This in turn will make it possible to create subnets within those VNETs in the same configuration file.

This PR fixes/adds/changes/removes

Adds two outputs.

Breaking changes

N/A.

Testing evidence

If I run the terraform plan with the config above and try to create a subnet it is impossible to refer to previously created VNETS (below) by name regardless of what's in 'virtual_network_name'

With outputs I am able to create subnets within VNETs created by module:

As part of this pull request I have

• [v] Checked for duplicate Pull Requests
• [V] Associated it with relevant issues, for tracking and closure.
• Run and make fmt & make docs to format your code and update documentation.
• [V] Created unit and deployment tests and provided evidence.
• [V] Updated relevant and associated documentation.

[TYYBG]

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