Cleanup client API

[asvetlov]

No description provided.

[codecov]

Codecov Report

Merging #879 into master will increase coverage by 0.85%.
The diff coverage is 98.71%.

@@            Coverage Diff             @@
##           master     #879      +/-   ##
==========================================
+ Coverage   89.86%   90.71%   +0.85%     
==========================================
  Files          38       37       -1     
  Lines        3601     3543      -58     
  Branches      520      509      -11     
==========================================
- Hits         3236     3214      -22     
+ Misses        265      229      -36     
  Partials      100      100

Impacted Files	Coverage Δ
neuromation/api/jobs.py	96.12% <100%> (+1.56%)	⬆️
neuromation/api/client.py	96.82% <100%> (ø)	⬆️
neuromation/api/storage.py	95.23% <100%> (-0.03%)	⬇️
neuromation/cli/job.py	83.75% <80%> (-0.07%)	⬇️

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