* [TD-182]<enhance>: use single repo for python connector

Remove code for each platform and build up one single python code base
for windows/osx/linux platforms and python2/python3 runtime.

* [TD-182]<enhance>: remove redundant code in python connector

* [TD-4149] <fix>: fix python connection config error

* [TD-3986]<fix>: fix subscribe test case error

* change jdbc version number

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

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

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

* [TD-3902]<fix>: taosdemo subscribe.

* [TD-3992]<fix>: taosdemo subscribe.

refactor sync/async mode.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-4073]<fix>: taosdemo rest query output to result file.

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix insecure strcat().

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix append function bug.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-4073]<fix>: taosdemo rest query output to result file.

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix insecure strcat().

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix postSql command mistake

* [TD-4073]<fix>: taosdemo rest query output to result file.

fix append function bug.

* [TD-4073]<fix>: taosdemo rest query output to result file.

prevent potential null file passed.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

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

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

* [TD-3992]<fix>: taosdemo subscribe.

* [TD-3992]<fix>: taosdemo subscribe.

refactor sync/async mode.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>