Lightning report [tikv:9002]TiKV server timeout when analyze enabled

[shuijing198799]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do? If possible, provide a recipe for reproducing the error.
   Lightning will failed for [tikv:9002]TiKV server timeout when analyze enabled

2. What did you expect to see?
   lightning import completed

3. What did you see instead?
   failed

4. Versions of the cluster

   • TiDB-Lightning version (run tidb-lightning -V):

Release Version: v4.0.8-42-g59cc48d
Git Commit Hash: 59cc48d
Git Branch: master
UTC Build Time: 2020-11-26 12:45:03
Go Version: go version go1.13.8 linux/amd64
```

- TiKV version (run `tikv-server -V`):

    ```

Release Version: 4.0.8
Edition: Community
Git Commit Hash: 30001da180ba2408b905df061a10a73e482a8172
Git Commit Branch: HEAD
UTC Build Time: 2020-12-07 09:03:56
Rust Version: rustc 1.42.0-nightly (0de96d37f 2019-12-19)
Enable Features: jemalloc mem-profiling portable sse protobuf-codec
Profile: release
```

[cyliu0]

Reproduced on 4.0.9 w/ 300+GB data

[cyliu0]

Reproduced on 4.0.9 while importing 4TB tpcc data

[Little-Wallace]

Closed by #540