* restore .gitmodules

* Revert "[TD-13408]<test>: move tests directory out"

This reverts commit 7db7bd9337cedc4cd0e3f3b16618b97d09791eaa.

* revert to make tests back

* immigrate file change in stand-alone repo to TDengine

* remove tests repository checkout
Co-authored-by: Ntangfangzhi <fztang@taosdata.com>

* [TD-13408]<test>: move tests directory out

* restore Jenkinsfile due to tests dir removal

* add --remote parameter to git submodule update

* git reset hard before checkout to branch

* call git submodule update for some submodules

* remove tests directory before checkout due to conflict

* as all branches remove tests, no need to remove it in script
Co-authored-by: Ntangfangzhi <fztang@taosdata.com>

* [TD-5398]<fix>: taosdemo 4096 columns table creation failed.

* change column name prefix from col to c for maxium column number to fix buffer length.

* use accurate buffer length.

* fix test case for column name be shorter.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-5398]<fix>: taosdemo 4096 columns table creation failed.

* change column name prefix from col to c for maxium column number to fix buffer length.

* fix test case for column name be shorter.

* use accurate buffer length.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3401]<fix>: taosdemo query statistic.

refactor func name.

* [TD-3401]<fix>: taosdemo query statistic.

refactor func name 2.

* [TD-3401]<fix>: taosdemo support query statistic.

implementation.

* cleanup
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3683]<fix>: reduce buffer size for more stable table creation.

* [TD-3683]<fix>: taosdemo create lots of tables.

clean up.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>