feat: add mdns

[gocarlos]

Specify library name and version: mdns/master

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[conan-center-bot]

config.yml syntax error in build 1:

Only one library can be changed in the same PR: [mdns/all, rocksdb/all]|

[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 2 (5c92925187bd5548159120dc9f7098728f9210a5):

• Linux x86_64, Release, gcc 5, libstdc++ . Options: mdns:shared-True
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 3 (34bfec08c8dc4d702127d15fb3dcd7a0685c3cd5):

• Linux x86_64, Release, gcc 5, libstdc++ . Options: mdns:shared-True
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 4 (f271825a652fca7acd44d37680fa7bc5c9b963d3):

• Linux x86_64, Release, gcc 5, libstdc++ . Options: mdns:shared-True
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 5 (7168f03eb19b63cbd6182468a2688d78cceb6ef7):

• Linux x86_64, Release, gcc 5, libstdc++ . Options: mdns:shared-True
  • Hooks errors detected:
    • [HOOK - conan-center.py] post_package(): ERROR: [PACKAGE LICENSE (KB-H012)] No 'licenses' folder found in package: /tmp/c3ipr/pr_974_5_0_0/.conan/data/mdns/20200225/_/_/package/e30939caa2339df448fcf9917da7b5ebc54646b6 (https://github.com/conan-io/conan-center-index/wiki/Error-Knowledge-Base#KB-H012)
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 6 (0c09a262f8fa152057f65954d4c899405faeb2de):

• Linux x86_64, Release, gcc 5, libstdc++ . Options: mdns:shared-True
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 7 (c315406b6879a79df987ebe8d2e971f7359274f6):

• Linux x86_64, Release, gcc 5, libstdc++ . Options: mdns:shared-True
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 8 (03dbf9f0a2305b8e023cedf5659aad752a52939c):

• Macos x86_64, Debug, apple-clang 9.1, libc++ . Options: mdns:shared-True
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 9 (6741f0483f1fec9b45204ec29cda3039908c407d):

• Linux x86_64, Release, gcc 5, libstdc++ . Options: mdns:shared-True
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[conan-center-bot]

Some configurations of 'mdns/20200225' failed in build 10 (5ff307df6bef4e07ded8a133888bc46244c80371):

• Linux x86_64, Release, gcc 5, libstdc++
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[conan-center-bot]

All green in build 11 (73bc7325d7791efcb4acbe3431c7c0dc414b6d0f)! 😊

• mdns/20200225: Generated 1 packages. All logs here

[conan-center-bot]

All green in build 12 (6c117c50f57f9f6dcbd85c40abe12e704c084a92)! 😊

• mdns/20200130: Generated 1 packages. All logs here

[conan-center-bot]

All green in build 13 (28d841e7d06a3a8e03d3914f3836b1d5e0879eb2)! 😊

• mdns/20200130: Generated 1 packages. All logs here

[gocarlos]

@danimtb please review this

[uilianries]

I gonna restart it, because the last builds failed on CI.

[conan-center-bot]

All green in build 16 (28d841e7d06a3a8e03d3914f3836b1d5e0879eb2)! 😊

• mdns/20200130: Generated 1 packages. All logs here