fix some issues in timer

fix several issues in string token parsing

improve memory pool

fix memory leak when request body is gziped

temporary fix for running server-side application on WSL

add config by cmake compiler

Upgrade org.apache.zookeeper:zookeeper to version 3.4.14 to avoid vulnerability

upgrade the version of dependency "com.fasterxml.jackson.core" from "2.9.5" to "2.9.9" to avoid vulnerability.

add opentsdb test code

fix strtolower