Merge pull request #3925 from berendt/reworking_OC_Files_Storage_AmazonS3

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

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

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

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

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

...s-sdk-php/Aws/Common/Client/ExpiredCredentialsChecker.php

.../aws-sdk-php/Aws/Common/Client/ThrottlingErrorChecker.php

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

...party/aws-sdk-php/Aws/Common/Client/UserAgentListener.php

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

...l/3rdparty/aws-sdk-php/Aws/Common/Command/JsonCommand.php

.../3rdparty/aws-sdk-php/Aws/Common/Command/QueryCommand.php

...sdk-php/Aws/Common/Command/XmlResponseLocationVisitor.php

...p/Aws/Common/Credentials/AbstractCredentialsDecorator.php

...Aws/Common/Credentials/AbstractRefreshableCredentials.php

...s-sdk-php/Aws/Common/Credentials/CacheableCredentials.php

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

...s-sdk-php/Aws/Common/Credentials/CredentialsInterface.php

...mon/Credentials/RefreshableInstanceProfileCredentials.php

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