Yi Wu 20269d080a Fix DBFlushTest::ManualFlushWithMinWriteBufferNumberToMerge dead lock
Summary:
In the test, there can be a dead lock between background flush thread and foreground main thread as following:
* background flush thread:
  - holding db mutex, while
  - waiting on "DBImpl::FlushMemTableToOutputFile:BeforeInstallSV" sync point.
* foreground thread:
  - waiting for db mutex to write "key2"

Fixing by let background flush thread wait without holding db mutex.
Closes https://github.com/facebook/rocksdb/pull/3436

Differential Revision: D6841334

Pulled By: yiwu-arbug

fbshipit-source-id: b020768ac94e166e40953c5d09e505515a5f244d
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