Automatic merge from submit-queue
Quote groups in deny log message
Helps distinguish cases where an external authenticator is incorrectly combining multiple groups into one.
Before:
> RBAC DENY: user "bob" groups [system:masters view system:authenticated] cannot "list" resource "pods" cluster-wide
After:
> RBAC DENY: user "bob" groups ["system:masters view" "system:authenticated"] cannot "list" resource "pods" cluster-wide
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