Implement neuro config login-with-token command

[asvetlov]

No description provided.

[codecov]

Codecov Report

Merging #712 into master will decrease coverage by 0.34%.
The diff coverage is 37.03%.

@@            Coverage Diff             @@
##           master     #712      +/-   ##
==========================================
- Coverage   90.07%   89.72%   -0.35%     
==========================================
  Files          41       41              
  Lines        3224     3242      +18     
  Branches      455      456       +1     
==========================================
+ Hits         2904     2909       +5     
- Misses        237      250      +13     
  Partials       83       83

Impacted Files	Coverage Δ
neuromation/cli/defaults.py	100% <ø> (ø)	⬆️
neuromation/api/config_factory.py	65.45% <14.28%> (-3.48%)	⬇️
neuromation/api/__init__.py	93.87% <33.33%> (ø)	⬆️
neuromation/cli/config.py	76% <47.05%> (-6.54%)	⬇️

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[asvetlov]

Manually tested