Retrieves and returns an auth token for accessing etcd. This function is based on the algorithm in https://git.io/vHzwh.
Returns metadata used to make a call to etcd.
Invalides the cached metadata. Clients should call this if they detect that the authentication is no longer valid.
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Retrieves and returns an auth token for accessing etcd. This function is based on the algorithm in https://git.io/vHzwh.