Merge pull request #10680 from helmutschneider/aws-2.6.15

apps/files_external/3rdparty/aws-sdk-php/Aws/Common/Aws.php

...3rdparty/aws-sdk-php/Aws/Common/Client/AbstractClient.php

.../3rdparty/aws-sdk-php/Aws/Common/Client/ClientBuilder.php

.../3rdparty/aws-sdk-php/Aws/Common/Client/DefaultClient.php

...arty/aws-sdk-php/Aws/Common/Client/UploadBodyListener.php

...dparty/aws-sdk-php/Aws/Common/Command/AwsQueryVisitor.php

...dparty/aws-sdk-php/Aws/Common/Credentials/Credentials.php

...ty/aws-sdk-php/Aws/Common/Credentials/NullCredentials.php

...al/3rdparty/aws-sdk-php/Aws/Common/Enum/ClientOptions.php

..._external/3rdparty/aws-sdk-php/Aws/Common/Enum/Region.php

...ty/aws-sdk-php/Aws/Common/Exception/TransferException.php

...xternal/3rdparty/aws-sdk-php/Aws/Common/Facade/Facade.php

...3rdparty/aws-sdk-php/Aws/Common/Facade/facade-classes.php

...xternal/3rdparty/aws-sdk-php/Aws/Common/HostNameUtils.php

...hp/Aws/Common/InstanceMetadata/InstanceMetadataClient.php

...y/aws-sdk-php/Aws/Common/Iterator/AwsResourceIterator.php

...dk-php/Aws/Common/Iterator/AwsResourceIteratorFactory.php

.../3rdparty/aws-sdk-php/Aws/Common/Resources/aws-config.php

...ty/aws-sdk-php/Aws/Common/Signature/AbstractSignature.php

...y/aws-sdk-php/Aws/Common/Signature/SignatureInterface.php