Automatic merge from submit-queue
pkg/client/leaderelection: log err when retrieving endpoint
The leader election code currently suppresses errors when trying to retrieve an endpoint. This can lead to difficult to debug situations.
In the case of a mis-configured controller-manager or scheduler - where they fail to contact an apiserver - this currently leads to no log output in the default case, or `failed to renew lease foo/bar` in `--v=4`, which isn't very actionable.
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