Adding 'Spot' to 'Priority' enum property (Swagger PR: https://github.com/Azure/azure-rest-api-specs/pull/7748); Updating '--max-billing' parameter to '--max-price'; Making '--max-price' updatable in VM and VMSS

[rakeshakkera]

Resource Provider
What is the Azure resource provider your feature is part of?
Azure Compute

Description of Feature or Work Requested
- Add 'Spot' enum value to 'Priority' enum.
- Rename '--max-billing' parameter to '--max-price', for both VM and VMSS, to be consistent with Swagger and Powershell cmdlets (link to PS cmdlet https://docs.microsoft.com/en-us/powershell/module/az.compute/new-azvm?view=azps-3.0.0). This might be considered as a breaking change but it should be okay since the feature is still in private preview.
- We now support update of priority only between 'Low' and 'Spot' for both VM and VMSS. So 'az vm update' and 'az vmss update' should support the update of priority between 'Low' and 'Spot' enum values. Note: Update of priority between 'Low' and 'Regular', also between 'Spot' and 'Regular' are not allowed.
- VM supports the update of '--max-price' when the VM is deallocated. So the cmdlet 'az vm update' should support the update of '--max-price'. The service already supports this.
- VMSS supports the update of '--max-price' when the VMSS VMs are deallocated. So the cmdlet 'az vmss update' should support the update of '--max-price'. The service already supports this.

Minimum API Version Required
What is the minimum API version of your service required to implement your feature?
2019-03-01.

Swagger Link
Provide a link to the location of your feature(s) in the REST API specs repo. If your feature(s) has corresponding commit or pull request in the REST API specs repo, provide them. This should be on the master branch of the REST API specs repo.
Azure/azure-rest-api-specs#7748

Target Date
If you have a target date for release of this feature/work, please provide it. While we can't guarantee these dates,
it will help us prioritize your request against other requests.
S161 - 11/26/2019

[fengzhou-msft]

@qwordy please take a look.

[qwordy]

Do you have any description of the 'Spot' enum value?
And in Compute 2019-07-01, there is no spot value.

class VirtualMachinePriorityTypes(str, Enum):
    regular = "Regular"
    low = "Low"

[rakeshakkera]

@qwordy : I am not sure why you are not seeing the Spot value in Compute 2019-07-01. Looks at the snapshot below. It clearly show that VirtualMachinePriorityTypes has 'Spot' Enum value.

[qwordy]

Had a call with Rakesh. Prioritize first two features. Put the rest into next sprint.

[qwordy]

#11035 is merged.

[qwordy]

@qwordy : I am not sure why you are not seeing the Spot value in Compute 2019-07-01. Looks at the snapshot below. It clearly show that VirtualMachinePriorityTypes has 'Spot' Enum value.

No problem now. There is a delay between Python SDK and swagger. Python SDK is not auto released when there is a update in swagger. So I manually ask the owner of Python SDK to release a new version.