Anthony Romano b2a465e354 grpcproxy/cache: only check compaction revision for historical revisions
Since the current revision is 0, it'll always be less than the compaction
revision. If the proxy sees a compaction, it would always reject the
current revision requests since it's less than the compaction revision.
Instead, check if the revision is historical before trying to reject on
compaction revision.

Fixes #7599
2017-03-24 13:20:46 -07:00
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