feat: optionally create edge enabled virtual machine

[roel4ez]

Checklist

This checklist is used to make sure that common guidelines for a pull request are followed.

• [ ] Versions update reflected in all places (both init.py files, CHANGELOG, setup.py, setup.cfg)
• [ ] Unit tests pass locally
• [ ] Quickstart steps locally validated
• [ ] Passes unit tests in CICD pipeline (green on Github pipeline)
• [ ] Pypi RC version passes Edge CICD pipeline validation for cross-tool validation
• [ ] Pull request includes test coverage for the included changes
• [x] Documentation is updated for the included changes

General guidelines

• [x] Title of the pull request is clear and informative.
• [x] There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR.

Description

Fixes #552

This PR adds an optional flag to iotedgedev iothub setup to also create an edge-enabled virtual machine. It uses the deployment template available at https://github.com/Azure/iotedge-vm-deploy - it will be incrementally applied.

Additional information

The user will be prompted for an ssh key - if there is none, one will be created (id_rsa_iotedgedev in the ~/.ssh directory).

Known issues

• It is not possible to pass a name for the virtual machine to the deployment template, one will be created randomly.
• The template sets up a default-allow-22 inbound port rule - this is not ideal.
• The output of the template is not captured, the user has to check the portal for the login details