change request metadata error to warning

[oferda4]

Changes

Make log of "Unable to request metadata from node" warning instead of error as it's handled. This is the same as in line 246 in the same file.
This change will allow to better monitor errors from this lib and distinguish them from warnings.

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• Add a new news fragment into the CHANGES folder
  • name it <issue_id>.<type> (e.g. 588.bugfix)
  • if you don't have an issue_id change it to the pr id after creating the PR
  • ensure type is one of the following:
    • .feature: Signifying a new feature.
    • .bugfix: Signifying a bug fix.
    • .doc: Signifying a documentation improvement.
    • .removal: Signifying a deprecation or removal of public API.
    • .misc: A ticket has been closed, but it is not of interest to users.
  • Make sure to use full sentences with correct case and punctuation, for example: Fix issue with non-ascii contents in doctest text files.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.04%. Comparing base (c10fed0) to head (7841796).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1009   +/-   ##
=======================================
  Coverage   95.04%   95.04%           
=======================================
  Files         114      114           
  Lines       16906    16906           
  Branches     2759     2759           
=======================================
  Hits        16068    16068           
  Misses        493      493           
  Partials      345      345           

Flag	Coverage Δ
cext	91.94% <100.00%> (-0.02%)	⬇️
integration	94.69% <100.00%> (ø)
purepy	94.49% <100.00%> (ø)
unit	52.72% <0.00%> (-0.02%)	⬇️

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