update obagent query response time config

modify query response time config

See merge request !1722521

add build rpm logic

add query_response_time metrics

update version

fix #22 quit when start http server failed

optimize document

add ob log and mysql related kv config

support ob log alarm collect and send to alertmanager

Mysqld exporter config

* optimize document, explain how to start prometheus with the right config file and add grafana config section

* add config doc for mysql

add mysqld exporter

Add go test action

fix test in package config