Stores the state as a given key in a given bucket on [Microsoft Azure Storage](https://azure.microsoft.com/en-us/documentation/articles/storage-introduction/).
-> **Note:** Passing credentials directly via config options will
make them included in cleartext inside the persisted state.
Use of environment variables or config file is recommended.
*`resource_group_name` - (Optional) The name of the resource group for the storage account. This is required when using the ARM credentials described below.
*`arm_subscription_id` - (Optional) The subscription ID to use. It can also
be sourced from the `ARM_SUBSCRIPTION_ID` environment variable.
*`arm_client_id` - (Optional) The client ID to use. It can also be sourced from
the `ARM_CLIENT_ID` environment variable.
*`arm_client_secret` - (Optional) The client secret to use. It can also be sourced from
the `ARM_CLIENT_SECRET` environment variable.
*`arm_tenant_id` - (Optional) The tenant ID to use. It can also be sourced from the