Fix blocking evictions when flash is enabled #823
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In current setup, with flash enabled, each eviction evicts 5% of memory in a blocking and no-bail-out way. For large datasets the eviction will saturate the main thread for seconds and the server is unavailable for both reads and writes.
In my understanding, eviction works very similar with or without flash enabled, since eviction doesn't require any flash db deletions, only in memory data free-up. Therefore it should be fine to evict data just like pure in-memory mode.
#814