If an RP does not have an implementation of ListBySubscription then they should make use of the Generic Resource Manager REST API.

[amarzavery]

https://msdn.microsoft.com/en-us/library/dn790567.aspx

Example:

https://management.azure.com/subscriptions/{subscription-id}/resources?$top={top}$skiptoken={skiptoken}&$filter={filter}&api-version={api-version}
parameters: [
{  
           "name": "$filter",  
          "in": "query",  
           "required": true,  
           "type": "string",  
           "enum": [ "resourceType eq 'Microsoft.KeyVault/vaults'" ],  <<<<<< Example
            "description": "The filter to apply on the operation."  
},  
]

• VirtualMachineScaleSetVMs_List but does not have ListAll
• AvailabilitySets_List but does not ListAll.

This gives us complete functionality in the generated SDK for that RP, thus making it simple for the CLI.