neofs-adm: retrieve storage wallet passwords from config

[fyrchik]

The only question is whether it is more convenient to store passwords in the credentials section.
Decided to add a separate section not to overload the credentials section.

Signed-off-by: Evgenii Stratonikov evgeniy@nspcc.ru

[codecov]

Codecov Report

Merging #1539 (22f3c14) into master (b67974a) will decrease coverage by 0.01%.
The diff coverage is 8.33%.

@@            Coverage Diff             @@
##           master    #1539      +/-   ##
==========================================
- Coverage   35.76%   35.75%   -0.02%     
==========================================
  Files         308      308              
  Lines       18278    18288      +10     
==========================================
+ Hits         6537     6538       +1     
- Misses      11191    11200       +9     
  Partials      550      550              

Impacted Files	Coverage Δ
cmd/neofs-adm/internal/modules/config/config.go	30.00% <0.00%> (-2.31%)	⬇️
cmd/neofs-adm/internal/modules/morph/generate.go	40.70% <0.00%> (-1.50%)	⬇️
cmd/neofs-adm/internal/modules/morph/root.go	50.40% <100.00%> (+0.40%)	⬆️

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