Several UX improvements

[asvetlov]

By suggestions from @genn

[codecov]

Codecov Report

Merging #486 into master will increase coverage by 0.01%.
The diff coverage is 95.4%.

@@            Coverage Diff             @@
##           master     #486      +/-   ##
==========================================
+ Coverage   91.44%   91.45%   +0.01%     
==========================================
  Files          40       40              
  Lines        2886     2925      +39     
  Branches      379      386       +7     
==========================================
+ Hits         2639     2675      +36     
  Misses        188      188              
- Partials       59       62       +3

Impacted Files	Coverage Δ
python/neuromation/cli/formatters/config.py	100% <100%> (ø)	⬆️
python/neuromation/cli/formatters/jobs.py	100% <100%> (ø)	⬆️
python/neuromation/cli/job.py	97.02% <100%> (ø)	⬆️
python/neuromation/cli/main.py	58.91% <87.5%> (+5.07%)	⬆️
python/neuromation/cli/utils.py	93.75% <96.15%> (-3.25%)	⬇️

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