Merge branch '3.0' of https://github.com/goagent/goagent into SayCV_goagent
refine dnsproxy
bugfix for dnsproxy
use dnslib
refine httputil dns_resolve
refine dnsproxy
refine proxy.py
fix macos issue
refine dnsproxy
refine remote dns resovle
refine proxy.py
refine remote dns resolve
refine dnsproxy
refine dnsproxy
refine dns proxy
refine local dns resolve
add geoip
refine dnsproxy
refine GeoIP.dat path
refine dnsproxy