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Merge pull request #3182 from taosdata/feature/sangshuduo/add-a-badge-to-indicate-docker-pull-number

add a badge to indicate docker image pull number.

[TECO-7]

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[fix bug]

Feature/os

TD-1184 add error code

Master

Fmaster/lihui

merge from develop into masetr

[update ver info]

[TD-1190]

Hotfix/jdbcmemleak

modify packaging tools for grafana plugin changed to submodule.

fix jdbc memory leaks. #3098