results refuse to show 'id' property

- If the issue is to do with Azure CLI 2.0 in-particular, create an issue here at [Azure/azure-cli](https://github.com/Azure/azure-cli/issues)

### Extension name (the extension in question)
az pipelines

### Description of issue (in as much detail as possible)
I have noticed this with a few different AZ Cli commands but have not figured out why when I run a command like:

`az pipelines release definition list --output table`

It will return a table containing ID, name, created by and created on fields.

But if I then run:

`az pipelines release definition list --query "[].{id:id, name:name}" --output table`

The results refuse to show the id field but just the name field.

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