remove rackspace opencloud libs from files_external 3rdparty

apps/files_external/3rdparty/php-opencloud/LICENSE

apps/files_external/3rdparty/php-opencloud/lib/Autoload.php

...rnal/3rdparty/php-opencloud/lib/OpenCloud/Common/Base.php

...rdparty/php-opencloud/lib/OpenCloud/Common/Collection.php

...-opencloud/lib/OpenCloud/Common/Exceptions/AsyncError.php

...ncloud/lib/OpenCloud/Common/Exceptions/AsyncHttpError.php

...oud/lib/OpenCloud/Common/Exceptions/AsyncTimeoutError.php

...ncloud/lib/OpenCloud/Common/Exceptions/AttributeError.php

...d/lib/OpenCloud/Common/Exceptions/AuthenticationError.php

...encloud/lib/OpenCloud/Common/Exceptions/BaseException.php

...hp-opencloud/lib/OpenCloud/Common/Exceptions/CdnError.php

...pencloud/lib/OpenCloud/Common/Exceptions/CdnHttpError.php

.../lib/OpenCloud/Common/Exceptions/CdnNotAvailableError.php

...opencloud/lib/OpenCloud/Common/Exceptions/CdnTtlError.php

...cloud/lib/OpenCloud/Common/Exceptions/CollectionError.php

.../lib/OpenCloud/Common/Exceptions/ContainerCreateError.php

.../lib/OpenCloud/Common/Exceptions/ContainerDeleteError.php

...ncloud/lib/OpenCloud/Common/Exceptions/ContainerError.php

...ud/lib/OpenCloud/Common/Exceptions/ContainerNameError.php

...ib/OpenCloud/Common/Exceptions/ContainerNotEmptyError.php