Avoid printing hidden flags and commands with custom help.

[harshavardhana]

Always use .VisibleFlags and .VisibleCommands in templates
to avoid printing hidden flags and commands in the help
template.

[codecov-io]

Codecov Report

Merging #2015 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #2015   +/-   ##
======================================
  Coverage    8.59%   8.59%           
======================================
  Files          86      86           
  Lines        6670    6670           
======================================
  Hits          573     573           
  Misses       5960    5960           
  Partials      137     137

Impacted Files	Coverage Δ
cmd/admin-service-status.go	0% <ø> (ø)	✅
cmd/cp-main.go	0% <ø> (ø)	✅
cmd/pipe-main.go	0% <ø> (ø)	✅
cmd/share-upload-main.go	0% <ø> (ø)	✅
cmd/cat-main.go	0% <ø> (ø)	✅
cmd/admin-main.go	0% <ø> (ø)	✅
cmd/update-main.go	0% <ø> (ø)	✅
cmd/admin-service.go	0% <ø> (ø)	✅
cmd/rm-main.go	0% <ø> (ø)	✅
cmd/admin-heal.go	0% <ø> (ø)	✅
... and 23 more

---

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