Enable storage-cli for AWS (#4855)

storage-cli with v0.0.4 implements the missing commands for AWS/S3
needed by ccng.

Author: johha

lib/cloud_controller/blobstore/storage_cli/storage_cli_client.rb

@@ -25,7 +25,7 @@ class StorageCliClient < BaseClient
         'Google' => 'gcs'
       }.freeze
 
-      IMPLEMENTED_PROVIDERS = %w[AzureRM aliyun Google].freeze
+      IMPLEMENTED_PROVIDERS = %w[AzureRM aliyun Google AWS].freeze
 
       def initialize(directory_key:, resource_type:, root_dir:, min_size: nil, max_size: nil)
         raise 'Missing resource_type' if resource_type.nil?

spec/unit/lib/cloud_controller/blobstore/storage_cli/storage_cli_client_spec.rb

@@ -49,7 +49,7 @@ module Blobstore
 
           expect do
             StorageCliClient.new(directory_key: 'dummy-key', root_dir: 'dummy-root', resource_type: 'droplets')
-          end.to raise_error(RuntimeError, 'Unimplemented provider: UnknownProvider, implemented ones are: AzureRM, aliyun, Google')
+          end.to raise_error(RuntimeError, 'Unimplemented provider: UnknownProvider, implemented ones are: AzureRM, aliyun, Google, AWS')
 
           droplets_cfg.close!
         end