DorianZheng 8c79f79208 Fix skip WAL for whole write_group when leader's callback fail (#4838)
Summary:
The original implementation has two problems:

1. f0dda35d7d/db/db_impl_write.cc (L478)
f0dda35d7d/db/write_thread.h (L231)

If the callback status of leader of the write_group fails, then the whole write_group will not write to WAL, this may cause data loss.

2. f0dda35d7d/db/write_thread.h (L130)
The annotation says that Writer.status is the status of memtable inserter, but the original implementation use it for another case which is not consistent with the original design. Looks like we can still reuse Writer.status, but we should modify the annotation, so Writer.status is not only the status of memtable inserter.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4838

Differential Revision: D13574070

Pulled By: yiwu-arbug

fbshipit-source-id: a2a2aefcfd329c4c6a91652bf090aaf1ce119c4b
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