Including following commits:
- tikv/titan#221
- tikv/titan#218
- tikv/titan#219
- tikv/rocksdb#258
Signed-off-by: tabokie <xy.tao@outlook.com>

Signed-off-by: tabokie <xy.tao@outlook.com>

Including:
```
* 32b29a1cb Add an option to disable write stall (#251) (#252)
* caa2f8a49 Fix build on branch tikv-5.0 (#254)
```

And remove rust-toolchain to pass CI.

Signed-off-by: tabokie <xy.tao@outlook.com>

Signed-off-by: tabokie <xy.tao@outlook.com>

Signed-off-by: tabokie <xy.tao@outlook.com>

Update rocksdb with the following arm crc32 improvements
```
3ddff2edd 2021-03-16 54057110+houbingji.. arm64 crc prefetch optimise (#5773)
4889caa5e 2021-03-16 53242408+zhiwei-da.. crc32c_arm64 performance optimization (#5675)
```

Update titan with the following fix and improvements
```
1f2dd4e 2021-03-17 yiwu@pingcap.com     Add manifest_dump tool (#204)
738f6b5 2021-03-17 zhenhan.gong@gmail.. fix titan zstd dictionary compression bug (#202)
```
Signed-off-by: Yi Wu <yiwu@pingcap.com>

Signed-off-by: Yi Wu <yiwu@pingcap.com>

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

The rocksdb cloud integration currently cannot link, and we don't have current plan for it. The rocksdb cloud submodule makes code checkout slow. We are removing it for now.
Signed-off-by: Yi Wu <yiwu@pingcap.com>

Zstd introduces performance improvement since 1.4.7. 
We need to benchmark and upgrade to the latest version.
Signed-off-by: Zhenhan Gong <zhenhan.gong@gmail.com>

Signed-off-by: Yilin Chen <sticnarf@gmail.com>
Co-authored-by: ti-srebot <ti-srebot@pingcap.com>

Signed-off-by: qupeng <qupeng@pingcap.com>

Signed-off-by: qupeng <qupeng@pingcap.com>

update titan to include tikv/titan#201 for master
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
Co-authored-by: yiwu-arbug <yiwu@pingcap.com>

Allow sst partitioner methods to be mutable. On RocksDB side these methods are not const methods, thus should be mutable.
Signed-off-by: Yi Wu <yiwu@pingcap.com>

Signed-off-by: tabokie <xy.tao@outlook.com>

Accept generic construct instead of Arc to avoid nested arc required to bridge different crates. Also fix a missing export.
Signed-off-by: tabokie <xy.tao@outlook.com>

`uname -p` is unportable on some platforms.
Signed-off-by: Yang Keao <keao.yang@yahoo.com>
Co-authored-by: Xinye Tao <xy.tao@outlook.com>

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

Signed-off-by: Little-Wallace <bupt2013211450@gmail.com>

Signed-off-by: tabokie <xy.tao@outlook.com>

Add event listener for flush begin, compaction begin and subcompaction begin/completed.
Signed-off-by: tabokie <xy.tao@outlook.com>

port related interface to rust, add `file_system_inspected_env` factory method.
Signed-off-by: tabokie <xy.tao@outlook.com>

Add create_missing_column_families for DBOptions, so we can open a database with added column families.

Close #362.
Signed-off-by: Peilun Li <peilun.li@conflux-chain.org>

update titan to include tikv/titan#199 for master
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
Co-authored-by: yiwu-arbug <yiwu@pingcap.com>

* update rocksdb to atomize RenameFile in KeyManagedEncryptedEnv
* removed redundant rename logic from key manager
Signed-off-by: Xintao <hunterlxt@live.com>

Signed-off-by: tabokie <xy.tao@outlook.com>

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

update rocksdb to include tikv/rocksdb#205 for master
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>

update rocksdb to include tikv/rocksdb#192 for master
Signed-off-by: ti-srebot <ti-srebot@pingcap.com>