* restore .gitmodules for 2.0

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

This reverts commit 9d342bf3f5b404fc1014400060e012b387bfdb8c.

* immigarate file change from stand-alone repo to TDengine

for 2.0

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

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

for 2.0

* add Jenkinsfile2
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>

* cherry pick from develop branch.

* [TD-5136]<feature>: taosdemo simulate real senario.

* update test case according to taosdemo change

* adjust range of semi-random data.

btw, solve two taosdemo test cases too.