Performance : mutualize kubernetes client #537
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olevitt
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This PR allow mutualization of Kubernetes client so that only one is used instead of creating multiple ones for each incoming request.
Kubernetes client is thread-safe according to the library documentation.
This PR results in a HUGE decrease of the number of threads created by the API fixing #421
serviceAccountauthentication mode as other modes (impersonate&token passthrough) rely on specific client configuration