DorianZheng 09426ae1c7 Fix DBImpl::GetColumnFamilyHandleUnlocked data race (#4666)
Summary:
Hi, yiwu-arbug, I found that `DBImpl::GetColumnFamilyHandleUnlocked` still have data race condition, because `column_family_memtables_` has a stateful cache `current_` and `column_family_memtables_::Seek` maybe call without the protection of `mutex_` by a write thread

check 859dbda6e3/db/write_batch.cc (L1188)  and   859dbda6e3/db/write_batch.cc (L1756)  and  859dbda6e3/db/db_impl_write.cc (L318)

So it's better to use `versions_->GetColumnFamilySet()->GetColumnFamily` instead.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4666

Differential Revision: D13027117

Pulled By: yiwu-arbug

fbshipit-source-id: 4e3778eaf8e7f7c8577bbd78129b6a5fd7ce79fb
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