refine dnsproxy
Merge branch '3.0' of https://github.com/goagent/goagent into 3.0
Merge branch '3.0' of https://github.com/goagent/goagent into 3.0
refine get_dnsserver_list
refine wildcat cert
bugfix for adblock
set max_window=2 at low end cpu(ddwrt/openwrt/...)
Merge branch '3.0' of https://github.com/goagent/goagent into 3.0