ClientDBInfo may be unintentionally not set

[jzhou77]

The ClientDBInfo's comparison is through an internal UID and shrinkProxyList()
can change proxies inside ClientDBInfo. Since the UID is not changed by that
function, subsequent set can be unintentionally skipped.

This was not a big issue before. However, VV introduces a change that the
client side compares the returned proxy ID with its known set of GRV proxies
and will retry GRV if the returned proxy ID is not in the set. Due to the above
bug, GRV returned by a proxy is not within the client set, and results in
infinite retrying GRVs.

To reproduce: clang, commit c3c8511, seed fast/BlobGranuleVerifySmallClean.toml -s 934167474 -b on

100k correctness 20220416-045916-jzhou-1cb3f2053f483bdd passed.

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