* [TD-3973]<feature>: add jemalloc as submodule.

* [TD-3973]<feature>: add jemalloc as submodule.

* [TD-3973]<feature>: use jemalloc.

build works as following instructions:

cmake .. -DJEMALLOC_ENABLED=true

make

* fix jemalloc at tag 5.2.1

* fix conflicts

* make install works.

* fix conflicts.

* release script works.

* fix typo

* [TD-3937]<feature>: support jemalloc

add install funtion to all scripts.

* adjust install_jemalloc() position for check compatibility.

* fix position bug.

* add ldconfig for jemalloc library cache refresh.

* cherry pick from develop branch.

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

commit 0c81e3c0ba89c86f6d17d51d5056146e177cace5
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Fri May 14 10:27:13 2021 +0800

    [TD-4160]<fix>: remove python connector soft links, fix tests and documents

commit f439fce413423e7d7c97eef180c93d63dedab32e
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Wed May 12 18:50:53 2021 +0800

    [TD-182]: bump python connector version to v2.0.10 (#6091)

    Also fix url error in setup.py

commit 4ae55d494a262e482f6b34e8bf193cc6af62a886
Author: Huo Linhe <linhehuo@gmail.com>
Date:   Wed May 12 09:49:26 2021 +0800

    [TD-4370]<fix>: merge python connector changes to master

    Inludes:

    [TD-182]<enhance>: use single repo for python connector (#6036)

    * [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-3086]<fix>: clean out unnecessary file in packaging scripts

* [TD-4224]<enhance>: reduce grafana module size in packaging

* change

* [TD-4228]<fix>: error or warn while lost grafanaplugin or go submodule

Conflicts:
	packaging/deb/makedeb.sh
	packaging/rpm/tdengine.spec
	packaging/tools/make_install.sh
	packaging/tools/makeclient.sh
	packaging/tools/makeclient_power.sh
	packaging/tools/makepkg.sh
	packaging/tools/makepkg_power.sh
Co-authored-by: NHuo Linhe <linhehuo@gmail.com>