Nhat Nguyen f938c4267e Fix BWC issue for PreSyncedFlushResponse
I misunderstood how the bwc versions works. If we backport to 5.x, we
need to backport to all supported 6.*.  This commit corrects the BWC
versions for PreSyncedFlushResponse.

Relates #29103
2018-03-20 13:56:15 -04:00
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