ssh logging is missing username and instead contains the key-#

The INFO logging messages from gitlab-shell do show the key-id instead of the usersname making extreamly hard to check the logs.

The key-id is useful only for debug purposes but the username is essential for log checking.

Please fix this by including the username:

INFO -- : gitlab-shell: executing git command <git-upload-pack ... for user JONHD (key-XXX).