* Log IP on SSH authentication failure
fixes https://github.com/go-gitea/gitea/issues/13094
* include string 'Failed authentication attempt' in error
* update fail2ban docs
also match failed authentication over command line
* better logging of authentication errors with IP addresses
* format ...
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>