Add internal_hostname_named to JobDescription

[romasku]

Add support of neuro-inc/platform-api#1225
PR for server is neuro-inc/platform-api#1284

[codecov]

Codecov Report

Merging #1675 into master will decrease coverage by 0.17%.
The diff coverage is 76.00%.

@@            Coverage Diff             @@
##           master    #1675      +/-   ##
==========================================
- Coverage   76.78%   76.61%   -0.18%     
==========================================
  Files          59       59              
  Lines        8733     8774      +41     
  Branches     1424     1430       +6     
==========================================
+ Hits         6706     6722      +16     
- Misses       1829     1843      +14     
- Partials      198      209      +11     

Flag	Coverage Δ
#unit	76.61% <76.00%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
neuromation/api/utils.py	98.79% <ø> (ø)
neuromation/cli/topics.py	68.88% <ø> (ø)
neuromation/cli/config.py	57.40% <16.66%> (-0.46%)	⬇️
neuromation/cli/storage.py	31.57% <40.00%> (+0.01%)	⬆️
neuromation/api/jobs.py	82.61% <66.66%> (-0.21%)	⬇️
neuromation/api/storage.py	93.41% <84.61%> (-0.58%)	⬇️
neuromation/api/abc.py	100.00% <100.00%> (ø)
neuromation/cli/formatters/jobs.py	74.38% <100.00%> (-0.34%)	⬇️
neuromation/cli/formatters/storage.py	90.73% <100.00%> (+0.11%)	⬆️
neuromation/cli/asyncio_utils.py	62.25% <0.00%> (-5.97%)	⬇️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 045d759...84ddd0b. Read the comment docs.

[asvetlov]

LGTM after adding a changelog file.