Add image-foundry-hyperv to BuildCloudName

It currently appears in responses for getProjectSettings.

Also add comments that the ubuntu names no longer appear in the
responses.

Signed-off-by: Kevin Locke <[email protected]>

Author: kevinoid

openapi.yaml

@@ -1360,8 +1360,12 @@ components:
       enum:
       - azure-westus
       - gce
+      - image-foundry-hyperv
+      # No longer appears in getProjectSettings responses (2019-06-24):
       - pro-ubuntu
+      # No longer appears in getProjectSettings responses (2019-06-24):
       - pro-ubuntu18
+      # No longer appears in getProjectSettings responses (2019-06-24):
       - pro-vs2013
       # No longer appears in getProjectSettings responses (2018-12-29):
       - pro-win2016