* Add support for async query. Only insert result is parsed.

* Add support for connection pool.

* Add one case for lua connector in smoke test case list.

* Build dymanic library for lua connector before smoke test.

* [TD-4136]<fix>: taosdemo records per req more than 32767.

for develop branch.

* change taosRandom() to rand_bool() for bool data.

* [TD-4136]<fix>: taosdemo check insert rows not more than 32767.

check insert rows for progressive.

* fix with answer_yes.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

This reverts commit e8d2162c.

* DB/create: fix create database when default quorum > replica

* [TD-4081]<fix>: fix vnode dropping

* test/sim: fix null to 0 in show dnodes;

* [TD-4081]<fix>: [v3] fix vnode closing

* [TD-4081]<fix>: vnode not close if dropped

* Revert "test/sim: fix null to 0 in show dnodes;"

This reverts commit 70213e65.

* vnode/write: make last write msg to be written or confirmed

* vnode/drop: ingore invalid vgroup id if already dropped

* vnode/read: use app not ready instead of invalid vgroup id to make crash_gen happy

* vnode/close: wait write 900ms

* [td-4209]<fix>: add the uid check for super table metadata that is already cached in local buffer.

* [td-4209]

* [td-225] refactor a sim script.

* Hotfix/sangshuduo/td 4136 taosdemo records morethan 32767 (#6147)

* [TD-4136]<fix>: taosdemo max records per req < 32767

* [TD-4136]<fix>: taosdemo check insert rows not more than 32767.

check insert rows for progressive.

* fix with answer_yes.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-4240]<fix>: taosdemo subscribe more than max query sql count.
Co-authored-by: NMinglei Jin <mljin@taosdata.com>
Co-authored-by: NMinglei Jin <stephenk@gmx.us>
Co-authored-by: NShengliang Guan <slguan@taosdata.com>
Co-authored-by: NHaojun Liao <hjliao@taosdata.com>
Co-authored-by: Nhaojun Liao <hjxilinx@users.noreply.github.com>
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-4136]<fix>: taosdemo max records per req < 32767

* [TD-4136]<fix>: taosdemo check insert rows not more than 32767.

check insert rows for progressive.

* fix with answer_yes.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

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

[TD-4037]<test>: add taodemo-testcase that childtable_count is less than or equal zero and num_of_records_per_req  is  equal zero

By this commit, It will close TD-3639.

It will not require test case to write *correct* datetime string to pass
a test case. One test could use seconds, milliseconds or microseconds to
check data.

That means the three tests are equivalent:

```python
.checkData(0, 0, "2020-01-01 00:00:00")
.checkData(0, 0, "2020-01-01 00:00:00.000")
.checkData(0, 0, "2020-01-01 00:00:00.000000")
```
Co-authored-by: NHuo Linhe <linhehuo@gmail.com>

* [TD-4032]Eliminate false alarms

* update rules

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

modify smoketest.sh to python3.8

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

change focal to bionic.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

cherry pick from master.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

change focal to bionic.

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

install python3.8

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

install python3.8 and pip, setuptools

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

install python3.8, and install pip and setuptools

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

modify smoketest.sh to python3.8
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>