titan_stress failure about titan HOT 6 CLOSED

reported by @tabokie

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Reproduced locally. It crashes pretty quick. I got one crash with the above stack trace, and another one crashing at https://github.com/pingcap/titan/blob/468ddc9727428bf85403a63e6fa3f245d81e6de7/src/blob_format.cc#L171 where state_ equals to kNormal. Still debugging.

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The failure at TestPut is caused by Titan hitting background error "Column family drop", which is caused by a CF dropped while GC on the CF is still running. Filed #71 to track.

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Hit another db_stress failure, which is a db_stress bug and fixed in upstream. The thing is I didn't update titandb_stress to the version in rocksdb 6.4.x. Will make the update.

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The file state transit error seems to be caused by file size property collector not being called during flush and compaction sometimes. Still investigating.

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titandb_stress pass locally after patching with #72, #76 and #78.

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