Roll forward a fix for #862.

[illfelder]

Support retry limits in metadata retrieval.

[codecov]

Codecov Report

Merging #876 into development will not change coverage.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           development     #876   +/-   ##
============================================
  Coverage        97.37%   97.37%           
============================================
  Files               58       58           
  Lines             4801     4801           
  Branches           245      246    +1     
============================================
  Hits              4675     4675           
  Misses             108      108           
  Partials            18       18

Impacted Files	Coverage Δ
...ompute_engine/metadata_scripts/script_retriever.py	100% <ø> (ø)	⬆️
...ne/metadata_scripts/tests/script_retriever_test.py	100% <ø> (ø)	⬆️
...ogle_compute_engine/tests/metadata_watcher_test.py	100% <100%> (ø)	⬆️
...e-engine/google_compute_engine/metadata_watcher.py	100% <100%> (ø)	⬆️

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[wrigri]

/approve

[google-oss-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[google-oss-robot]

New changes are detected. LGTM label has been removed.