Repository password change support

[jkowalski]

This will only work for new repositories, since there's now a repository-wide flag that disables replication of kopia.repository contents in all packs.

[codecov]

Codecov Report

Merging #1197 (de8cac8) into master (bffe8b3) will increase coverage by 0.10%.
The diff coverage is 62.79%.

@@            Coverage Diff             @@
##           master    #1197      +/-   ##
==========================================
+ Coverage   67.88%   67.98%   +0.10%     
==========================================
  Files         358      360       +2     
  Lines       21068    21132      +64     
==========================================
+ Hits        14302    14367      +65     
- Misses       5231     5232       +1     
+ Partials     1535     1533       -2     

Impacted Files	Coverage Δ
cli/password.go	10.71% <0.00%> (-2.93%)	⬇️
repo/content/content_formatting_options.go	100.00% <ø> (ø)
repo/initialize.go	78.78% <50.00%> (+0.32%)	⬆️
repo/parameters.go	50.00% <50.00%> (ø)
repo/change_password.go	57.89% <57.89%> (ø)
cli/command_repository_change_password.go	65.00% <65.00%> (ø)
repo/open.go	67.85% <89.47%> (+5.51%)	⬆️
cli/command_repository.go	100.00% <100.00%> (ø)
cli/command_repository_create.go	74.11% <100.00%> (+0.62%)	⬆️
cli/command_repository_repair.go	78.84% <100.00%> (+5.76%)	⬆️
... and 16 more

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[julio-lopez]

just a nit.

[julio-lopez]

👍