hyperVGeneration required in 2019-07-01 compute API

[jackfrancis]

This PR introduced a new compute API version:

#2412

Test signal is telling us that the new API version delivered w/ that change requires a hyperVGeneration value:

Error from deployment for kubernetes-westus-65081 in resource group kubernetes-westus-65081:exit status 1
 2019/12/19 16:19:29 Command Output: ERROR: Deployment failed. Correlation ID: aae2de58-6ece-4430-ad90-0a7e2cc9055a. {
   "error": {
     "code": "InvalidParameter",
     "message": "Required parameter 'hyperVGeneration' is missing (null).",
     "target": "hyperVGeneration"
   }
 }

[marosset]

A quick fix for this was checked it with #2487 but that change hard-coded hyperVGeneration to 1 (the previous default).

A proper fix is still needed and likely involved specifying the generation in the apimodel

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.