Steps to reproduce the issue

Upgrade from 3.7.5 to 3.8 Beta4 and compare the file directories versus a full install

Expected result

no files left over in the updated site.

Actual result

Undeleted files:
'/libraries/joomla/http/factory.php',
'/libraries/joomla/http/http.php',
'/libraries/joomla/http/response.php',
'/libraries/joomla/http/transport.php',
'/libraries/joomla/http/transport/cacert.pem',
'/libraries/joomla/http/transport/curl.php',
'/libraries/joomla/http/transport/socket.php',
'/libraries/joomla/http/transport/stream.php',
'/libraries/joomla/http/wrapper/factory.php',

Undeleted directories:
'/libraries/joomla/http/transport',
'/libraries/joomla/http/wrapper',
'/libraries/joomla/http',
'/libraries/legacy/table/menu',
'/media/editors/tinymce/plugins/jdragdrop',

System information (as much as possible)

Additional comments

3 PR with file move: PR-17441 , PR-16306, PR-15057