Merge pull request #14151 from owncloud/update-sabre2.1

3rdparty

apps/files/appinfo/remote.php

apps/files_encryption/tests/webdav.php

apps/files_sharing/publicwebdav.php

lib/private/appframework/http/request.php

lib/private/connector/sabre/appenabledplugin.php

lib/private/connector/sabre/auth.php

lib/private/connector/sabre/custompropertiesbackend.php

lib/private/connector/sabre/directory.php

lib/private/connector/sabre/dummygetresponseplugin.php

lib/private/connector/sabre/exception/entitytoolarge.php

lib/private/connector/sabre/exception/filelocked.php

...rivate/connector/sabre/exception/unsupportedmediatype.php

lib/private/connector/sabre/exceptionloggerplugin.php

lib/private/connector/sabre/file.php

lib/private/connector/sabre/filesplugin.php

lib/private/connector/sabre/locks.php

lib/private/connector/sabre/maintenanceplugin.php

lib/private/connector/sabre/node.php

lib/private/connector/sabre/objecttree.php