#2429 Handle JSONDecodeError in dynamic client discovery

[tamilhce]

#2429

When the Kubernetes API server returns a 503 Service Unavailable error with a text/plain content type (instead of application/json), the dynamic client fails with an unhandled JSONDecodeError exception while trying to parse the response as JSON.

What type of PR is this?

/kind bug

What this PR does / why we need it:

When the Kubernetes API server returns a 503 Service Unavailable error with a text/plain content type (instead of application/json), the dynamic client fails with an unhandled JSONDecodeError exception while trying to parse the response as JSON.

Which issue(s) this PR fixes:

Fixes #2429

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

• ✅login: tamilhce / (d0cfad3)

The committers listed above are authorized under a signed CLA.

[k8s-ci-robot]

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This pull-request has been approved by: tamilhce
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[tamilhce]

FYI, similar changes are approved & merged for kubernetes_asyncio
tomplus/kubernetes_asyncio#368