HDFS-13522: IPC changes to support observer reads through routers.#4311

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simbadzina:feature/HDFS-13522-ipc

Commits on Sep 7, 2022

HDFS-13522: Add federated nameservices states to client protocol and propagate it between routers and clients.
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Avoiding denial of service between clients.
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Commits on Sep 8, 2022

Addressing review comments. Mostly refactoring.
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Commits on Sep 9, 2022

Formatting fixes.
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