Added the --exclude-from-files option in "neuro cp".

[serhiy-storchaka]

Closes #1560.

TODO: Update the API docs (they are outdated).

[codecov]

Codecov Report

Merging #1561 into master will increase coverage by 0.13%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master    #1561      +/-   ##
==========================================
+ Coverage   85.42%   85.55%   +0.13%     
==========================================
  Files          55       55              
  Lines        8307     8322      +15     
  Branches     1363     1367       +4     
==========================================
+ Hits         7096     7120      +24     
+ Misses        953      945       -8     
+ Partials      258      257       -1     

Flag	Coverage Δ
#e2e	60.10% <46.66%> (+0.16%)	⬆️
#unit	76.13% <86.66%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
neuromation/cli/topics.py	67.44% <ø> (ø)
neuromation/cli/storage.py	80.00% <83.33%> (+0.12%)	⬆️
neuromation/api/blob_storage.py	94.88% <100.00%> (+0.01%)	⬆️
neuromation/api/config.py	92.02% <100.00%> (ø)
neuromation/api/storage.py	95.00% <100.00%> (ø)
neuromation/cli/blob_storage.py	82.42% <100.00%> (+0.21%)	⬆️
neuromation/cli/asyncio_utils.py	64.90% <0.00%> (-0.67%)	⬇️
neuromation/cli/formatters/storage.py	96.21% <0.00%> (ø)
neuromation/cli/ael.py	43.32% <0.00%> (+1.63%)	⬆️
neuromation/cli/main.py	74.52% <0.00%> (+1.91%)	⬆️

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[asvetlov]

Looks good.
I think the option worth to be added to user config (like life-span or ps-columns)

[asvetlov]

Looks good, just a few minor text comments.