For regression test, add srs-bench to 3rdparty

trunk/3rdparty/srs-bench/vendor/github.com/pion/mdns/README.md

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+<h1 align="center">
+  <br>
+  Pion mDNS
+  <br>
+</h1>
+<h4 align="center">A Go implementation of mDNS</h4>
+<p align="center">
+  <a href="https://pion.ly"><img src="https://img.shields.io/badge/pion-mdns-gray.svg?longCache=true&colorB=brightgreen" alt="Pion mDNS"></a>
+  <a href="https://pion.ly/slack"><img src="https://img.shields.io/badge/join-us%20on%20slack-gray.svg?longCache=true&logo=slack&colorB=brightgreen" alt="Slack Widget"></a>
+  <br>
+  <a href="https://travis-ci.org/pion/mdns"><img src="https://travis-ci.org/pion/mdns.svg?branch=master" alt="Build Status"></a>
+  <a href="https://godoc.org/github.com/pion/mdns"><img src="https://godoc.org/github.com/pion/mdns?status.svg" alt="GoDoc"></a>
+  <a href="https://codecov.io/gh/pion/mdns"><img src="https://codecov.io/gh/pion/mdns/branch/master/graph/badge.svg" alt="Coverage Status"></a>
+  <a href="https://goreportcard.com/report/github.com/pion/mdns"><img src="https://goreportcard.com/badge/github.com/pion/mdns" alt="Go Report Card"></a>
+  <a href="LICENSE"><img src="https://img.shields.io/badge/License-MIT-yellow.svg" alt="License: MIT"></a>
+</p>
+<br>
+
+Go mDNS implementation. The original user is Pion WebRTC, but we would love to see it work for everyone.
+
+### Running Server
+For a mDNS server that responds to queries for `pion-test.local`
+```sh
+go run examples/listen/main.go
+```
+
+
+### Running Client
+To query using Pion you can run the `query` example
+```sh
+go run examples/query/main.go
+```
+
+You can use the macOS client
+```
+dns-sd -q pion-test.local
+```
+
+Or the avahi client
+```
+avahi-resolve -a pion-test.local
+```
+
+### References
+https://tools.ietf.org/html/rfc6762
+https://tools.ietf.org/id/draft-ietf-rtcweb-mdns-ice-candidates-02.html
+
+### Community
+Pion has an active community on the [Golang Slack](https://invite.slack.golangbridge.org/). Sign up and join the **#pion** channel for discussions and support. You can also use [Pion mailing list](https://groups.google.com/forum/#!forum/pion).
+
+We are always looking to support **your projects**. Please reach out if you have something to build!
+
+If you need commercial support or don't want to use public methods you can contact us at [team@pion.ly](mailto:team@pion.ly)
+
+### Contributing
+Check out the **[contributing wiki](https://github.com/pion/webrtc/wiki/Contributing)** to join the group of amazing people making this project possible:
+
+* [Sean DuBois](https://github.com/Sean-Der) - *Original Author*
+* [Konstantin Itskov](https://github.com/trivigy) - Contributor
+* [Hugo Arregui](https://github.com/hugoArregui)
+
+### License
+MIT License - see [LICENSE](LICENSE) for full text