neofs-adm: support better completion for set-policy

[fyrchik]

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

[codecov]

Codecov Report

Merging #1594 (f63e980) into master (466b9b4) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

❗ Current head f63e980 differs from pull request most recent head ae0a532. Consider uploading reports for the commit ae0a532 to get more accurate results

@@            Coverage Diff             @@
##           master    #1594      +/-   ##
==========================================
- Coverage   35.59%   35.59%   -0.01%     
==========================================
  Files         305      305              
  Lines       18280    18283       +3     
==========================================
  Hits         6507     6507              
- Misses      11223    11226       +3     
  Partials      550      550              

Impacted Files	Coverage Δ
cmd/neofs-adm/internal/modules/morph/root.go	48.93% <0.00%> (-1.07%)	⬇️

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[carpawell]

The issue number is missing.