bump vmware to 0.6.0

[ctaggart]

See https://github.com/virtustream/azure-vmware-virtustream-cli-extension/releases/tag/0.6.0

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General Guidelines

• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

For new extensions:

• My extension description/summary conforms to the Extension Summary Guidelines.

About Extension Publish

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Once your PR is merged into master branch, a new PR will be created to update src/index.json automatically.
The precondition is to put your code inside this repo and upgrade the version in the PR but do not modify src/index.json.

[yonzhan]

add to S169

[ctaggart]

Users of version 0.5.5 will now see:

following error: DeprecatedNamespace - Microsoft.VMwareVirtustream namespace is read only. Please use the Microsoft.AVS namespace.

Please merge this, so that the vmware extension works.