Commits on Aug 19, 2021

1. feat(compute/metadata): retry error when talking to metadata service …

   This was reported internally to be causing issues. This package is
   used by some of our auth flows so it should be good to make this
   package more resilient to transient failures. Implmentation inspired
   by what we do for some of our http based services.
   
   Because this package is currently not context aware I needed to add
   attempts so retrying does not happen forever. Five attempts was
   arbitrarily chosen.
   
   Fixes: #4642

   

   codyoss committed Aug 19, 2021
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2. review feedback

   

   codyoss committed Aug 19, 2021
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3. Merge branch 'master' into metadata-retry

   

   codyoss committed Aug 19, 2021
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4. remove unused var

   

   codyoss committed Aug 19, 2021
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5. add feedback

   

   codyoss committed Aug 19, 2021
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