Nhat Nguyen b158919542 Do not use mock engine in PrimaryAllocationIT (#44083)
PrimaryAllocationIT#testForceStaleReplicaToBePromotedToPrimary 
relies on the flushing when a shard is no long assigned. This behavior,
however, can be randomly disabled in MockInternalEngine.

Closes #44049
2019-07-10 12:26:34 -04:00
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