[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>

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")
```

Bumps commons-io from 2.4 to 2.7.
Signed-off-by: Ndependabot[bot] <support@github.com>

Bumps commons-io from 2.4 to 2.7.
Signed-off-by: Ndependabot[bot] <support@github.com>

* [TD-3414]<test>: add insert function with json files of taodemo-testcase -repeat

* [TD-3879]add stmt mode for taodemo go

* [TD-3414]<test>: add insert function with json files of taodemo-testcase

* [TD-3918] <test>  add case to verify the bug of TD-3897

* [TD-3453]<test>:modify filepath  in scripts

* Update fulltest.sh

* [TD-3918] <test> fix the case

* Update queryFilterTswithDateUnit.py

* [TD-3850]<fix>: fix vnode write enqueue flowctrl UAF & no response

* Hotfix/sangshuduo/td 3401 query statistic (#5907)

* [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

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

change us to ms.

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

increase sql buffer for query.

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

more accurate result.

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

modify last time logic.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* improve coverage of operations

* [TD-3944]<fix>: make default offline threshold to 10 days. (#5912)
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3572]<enhance>: response out of dnodes if #dnodes <= maxDbReplica

* [TD-3937]<test>: add taosdemo performance test compare scripts

* update script

* Hotfix/sangshuduo/td 3317 for master (#5921)

* [TD-3317]<fix>: taosdemo interlace insertion.

patch for master.

* [TD-3317]<fix>: taosdemo support interlace mode.

adjust remainder rows logic.

* [TD-3317]<fix>: taosdemo support interlace mode.

fix global and stable interlace rows logic.

* [TD-3317]<fix>: taosdemo support interlace mode.

fix 'interlaceRows' is used uninitialized
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3968]<fix>: taosdemo data length should be 16*1024
Co-authored-by: tomchon <haoran920c@163.com>
Co-authored-by: Nliuyq-617 <yqliu@taosdata.com>
Co-authored-by: Nwu champion <wuchampion@foxmail.com>
Co-authored-by: Nwu champion <cpwu@taosdata.com>
Co-authored-by: NMinglei Jin <mljin@taosdata.com>
Co-authored-by: Nhuili <52318143+plum-lihui@users.noreply.github.com>
Co-authored-by: NShengliang Guan <slguan@taosdata.com>
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>
Co-authored-by: NPing Xiao <pxiao@taosdata.com>