azure stream data is not useful for 'arm' (Azure Resource Manager) mode

$ sstream-query --keyring=/usr/share/keyrings/ubuntu-cloudimage-keyring.gpg --max=1 --json http://cloud-images.ubuntu.com/daily/streams/v1/com.ubuntu.cloud:daily:azure.sjson arch=amd64 release~xenial "region=West US 2"[
  {
    "arch": "amd64",
    "content_id": "com.ubuntu.cloud:daily:azure",
    "crsn": "West US 2",
    "datatype": "image-ids",
    "endpoint": "https://management.core.windows.net/",
    "format": "products:1.0",
    "id": "b39f27a8b8c64d52b05eac6a62ebad85__Ubuntu_DAILY_BUILD-xenial-16_04-LTS-amd64-server-20170621-en-us-30GB",
    "item_name": "usww2i3",
    "label": "daily",
    "product_name": "com.ubuntu.cloud.daily:server:16.04:amd64",
    "publabel": "Ubuntu Server 16.04 LTS DAILY",
    "pubname": "ubuntu-xenial-daily-amd64-server-20170621",
    "region": "West US 2",
    "release": "xenial",
    "root_size": "30GB",
    "updated": "Thu, 22 Jun 2017 06:06:26 +0000",
    "version": "16.04",
    "version_name": "20170621",
    "virt": "Hyper-V"
  }
]

The data there contains 'id' which can be passed into the Azure api in 'asm' mode, but is completely useless for 'arm' mode.

I see a few issues here:
  a.) It seems that azure has transitioned from 'West US 2' as a region name to 'westus2' (and similarly for other regions).
  b.) the urn is needed. urn can be seen with
   az vm image list --all --location=westus2 --output=json --publisher=Canonical
   See output at http://paste.ubuntu.com/24974649/
  {
    "offer": "UbuntuServer",
    "publisher": "Canonical",
    "sku": "17.10-DAILY",
    "urn": "Canonical:UbuntuServer:17.10-DAILY:17.10.201706210",
    "version": "17.10.201706210"
  },

It seems its likely useful to add the 'sku' to the available data as that can be input in some places.