fix err while connect invalid fqdn

* change to new product names

* change product names

fix:optimize log & change return value for async interface

docs: fix python connector docs

docs: optimization k8s deploy

docs: minor updates to 3.0 english docs

fix:judge if pTopic is NULL

Update 05-taosbenchmark.md

Update 05-taosbenchmark.md

Update 02-database.md

Update 05-taosbenchmark.md

Update 05-taosbenchmark.md