InternetDiscovery#8+yuanzhe:modify modules mdns
rm mdns/*
add mdns necessary file
Merge branch 'temp' into InterDiscovery#8-yuanzhe
InterDiscovery#8+yuanzhe:add necessary file to mdns modules
InterDiscovery#8+yuanzhe:modify mdns module
Merge pull request #15 from huyuanzhe/InterDiscovery#8-yuanzhe

Inter discovery#8 yuanzhe->wangfeng