[7.17](backport #30068) ZooKeeper module: Adapt to ZooKeeper 3.6+ mntr response fields' changes.

[mergify]

This is an automatic backport of pull request #30068 done by Mergify.

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[elasticmachine]

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• Start Time: 2022-02-22T13:40:43.744+0000

• Duration: 92 min 29 sec

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Total	11722

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @pfcoperez? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @pfcoperez? 🙏

[jsoriano]

@pfcoperez and this changelog entry too 🙂