Shorter log message when authentication fails.

Created by: Quazgar

The server currently prints a long AuthenticationException with a stack trace if authentication fails. Instead, it should rather print only a short message, to prevent log spamming

Imported comments:

By Timm Fitschen on 2020-04-30T09:56:54.249Z

closed

By Quazgar on 2020-04-30T09:56:09.793Z

mentioned in commit 1833ac22

By Quazgar on 2020-04-28T11:41:25.198Z

mentioned in merge request !39 (merged)

By Quazgar on 2020-04-28T11:40:00.844Z

mentioned in commit 35556246544e55af129d7d49dbb2ae955c51d2dc