Rust Client: fluvio.platform_version() does not update when underlying cluster is upgraded

[nicholastmosher]

I think that the VersionedSerialSocket (or some other related object) checks the cluster version on the first request exchanged with the cluster and then caches it. It is not noticeable if you continuously run fluvio version because it instantiates a new Fluvio Rust client object each time, but from the Rust client standpoint, if I have fluvio: Fluvio and I call fluvio.platform_version(), I would expect to always see an up-to-date version.

[sehz]

This would be only problem if same TCP connection is maintained during upgrade which is not possible

[nicholastmosher]

I suppose the expected behavior then would just be that the low-level client machinery should transparently handle reconnection, or the request should fail completely.

[sehz]

Yes

[nicholastmosher]

This seems like it would be closely related to #770. Linking so that we remember to re-visit this when that is done.

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