Standardise logging of failed authentication attempts in internal SSH

[zeripath]

Continuing on from #13953 continue to improve and standardise
logging from internal SSH.

Also updates the fail2ban setup

Signed-off-by: Andrew Thornton [email protected]

[codecov-io]

Codecov Report

Merging #13962 (701fbbd) into master (1837e64) will decrease coverage by 0.12%.
The diff coverage is 32.14%.

@@            Coverage Diff             @@
##           master   #13962      +/-   ##
==========================================
- Coverage   42.25%   42.12%   -0.13%     
==========================================
  Files         710      710              
  Lines       77226    77250      +24     
==========================================
- Hits        32628    32541      -87     
- Misses      39235    39359     +124     
+ Partials     5363     5350      -13     

Impacted Files	Coverage Δ
modules/ssh/ssh.go	43.19% <32.14%> (-1.03%)	⬇️
modules/notification/ui/ui.go	84.72% <0.00%> (-11.12%)	⬇️
models/issue_comment.go	45.46% <0.00%> (-7.26%)	⬇️
modules/notification/mail/mail.go	33.33% <0.00%> (-5.75%)	⬇️
modules/git/commit.go	49.67% <0.00%> (-3.95%)	⬇️
modules/notification/base/null.go	74.28% <0.00%> (-2.86%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
modules/notification/notification.go	83.92% <0.00%> (-2.68%)	⬇️
modules/charset/charset.go	68.53% <0.00%> (-2.25%)	⬇️
services/gitdiff/gitdiff.go	69.05% <0.00%> (-1.94%)	⬇️
... and 7 more

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