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streamclone: ensure the server sends the right amount of data

Description

streamclone: ensure the server sends the right amount of data

Otherwise, the client would fail with some confusing error. I have
seen an error which I think is this, perhaps due to a concurrent
revlog split, which streamclones do not handle correctly and would
result in a short read of the index of the revlog being split.

Differential Revision: https://phab.mercurial-scm.org/D11236