Fixing hard-coded test data failures identified against Azure Germany

[tombuildsstuff]

• Registering the CosmosDB (DocumentDB) Resource Provider
• Upgrading the examples to Ubuntu 16.04, since 14.04.2 isn't available in Azure Germany
• Exposing the Azure Environment in order to be able to get the DNS Suffixes for tests

[tombuildsstuff]

The OS upgrade passes against Azure Public (West US) and Azure Germany:

$ TF_ACC=1 envchain azurerm go test ./azurerm -v -timeout 120m -run TestAccAzureRMVirtualMachine_basicLinuxMachine_managedDisk_explicit
=== RUN   TestAccAzureRMVirtualMachine_basicLinuxMachine_managedDisk_explicit
--- PASS: TestAccAzureRMVirtualMachine_basicLinuxMachine_managedDisk_explicit (557.19s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm	557.220s

Traffic Manager tests too:

 $ TF_ACC=1 envchain azurerm go test ./azurerm -v -timeout 120m -run TestAccAzureRMTrafficManagerProfile_weighted
=== RUN   TestAccAzureRMTrafficManagerProfile_weighted
--- PASS: TestAccAzureRMTrafficManagerProfile_weighted (69.73s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm	69.745s

[catsby]

👍 assuming tests pass

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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