added azure_cloud parameter to Azure's cloud_config (#6321)

docs/azure.md

@@ -13,6 +13,13 @@ Before creating the instances you must first set the `azure_` variables in the `
 All of the values can be retrieved using the azure cli tool which can be downloaded here: <https://docs.microsoft.com/en-gb/azure/xplat-cli-install>
 After installation you have to run `az login` to get access to your account.
 
+### azure_cloud
+
+Azure Stack has different API endpoints, depending on the Azure Stack deployment. These need to be provided to the Azure SDK.
+Possible values are: `AzureChinaCloud`, `AzureGermanCloud`, `AzurePublicCloud` and `AzureUSGovernmentCloud`.
+The full list of existing settings for the AzureChinaCloud, AzureGermanCloud, AzurePublicCloud and AzureUSGovernmentCloud
+is available in the source code [here](https://github.com/kubernetes-sigs/cloud-provider-azure/blob/master/docs/cloud-provider-config.md)
+
 ### azure\_tenant\_id + azure\_subscription\_id
 
 run `az account show` to retrieve your subscription id and tenant id:

inventory/sample/group_vars/all/azure.yml

 ## When azure is used, you need to also set the following variables.
 ## see docs/azure.md for details on how to get these values
 
+# azure_cloud:
 # azure_tenant_id:
 # azure_subscription_id:
 # azure_aad_client_id:

roles/kubernetes/node/defaults/main.yml

@@ -143,3 +143,5 @@ azure_exclude_master_from_standard_lb: true
 azure_disable_outbound_snat: false
 # use instance metadata service where possible
 azure_use_instance_metadata: true
+# use specific Azure API endpoints
+azure_cloud: AzurePublicCloud

roles/kubernetes/node/tasks/cloud-credentials/azure-credential-check.yml

@@ -75,3 +75,8 @@
   fail:
     msg: "azure_vmtype is missing. Supported values are 'standard' or 'vmss'"
   when: azure_vmtype is not defined or not azure_vmtype
+
+- name: check azure_cloud value
+  fail:
+    msg: "azure_cloud has an invalid value '{{ azure_cloud }}'. Supported values are 'AzureChinaCloud', 'AzureGermanCloud', 'AzurePublicCloud', 'AzureUSGovernmentCloud'."
+  when: azure_cloud not in ["AzureChinaCloud", "AzureGermanCloud", "AzurePublicCloud", "AzureUSGovernmentCloud"]

roles/kubernetes/node/templates/cloud-configs/azure-cloud-config.j2

 {
+  "cloud": "{{ azure_cloud }}"
   "tenantId": "{{ azure_tenant_id }}",
   "subscriptionId": "{{ azure_subscription_id }}",
   "aadClientId": "{{ azure_aad_client_id }}",