Disable password complexity check default

[mrsdizzie]

These features enourange bad passwords/are annoying for people using better password methods, and at minimum we shouldn't force that as a default for obvious reasons. Disable any default check to avoid regular complaints.

Close #12284

[codecov-commenter]

Codecov Report

Merging #12557 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master   #12557      +/-   ##
==========================================
- Coverage   43.45%   43.44%   -0.02%     
==========================================
  Files         643      643              
  Lines       71142    71145       +3     
==========================================
- Hits        30914    30907       -7     
- Misses      35222    35228       +6     
- Partials     5006     5010       +4     

Impacted Files	Coverage Δ
modules/setting/setting.go	46.91% <100.00%> (+1.11%)	⬆️
modules/util/remove.go	65.38% <0.00%> (-15.39%)	⬇️
services/pull/update.go	51.92% <0.00%> (-5.77%)	⬇️
services/pull/temp_repo.go	26.59% <0.00%> (-3.20%)	⬇️
modules/process/manager.go	72.50% <0.00%> (-2.50%)	⬇️
modules/queue/unique_queue_disk_channel.go	53.84% <0.00%> (-1.54%)	⬇️
modules/git/repo.go	49.23% <0.00%> (-1.02%)	⬇️
services/pull/pull.go	41.57% <0.00%> (-0.70%)	⬇️
models/issue_comment.go	53.75% <0.00%> (-0.16%)	⬇️
... and 2 more

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