feat: add keystoneauth_kubeservicetoken authentication plugin#1876
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feat: add keystoneauth_kubeservicetoken authentication plugin#1876
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This change adds a keystoneauth OIDC access-token plugin that reads the current OIDC token from a file (access_token_file) instead of requiring a static inline token. It is designed for Kubernetes workload identity, where service-account/OIDC tokens rotate frequently and are projected to disk, making inline configuration brittle. The plugin preserves normal Keystone token caching and only re-reads the file when keystoneauth reauthenticates near Keystone token expiry, so rotated Kubernetes tokens are picked up automatically without forcing reauthentication on every request.