[Merge] ~khurshid-alam/unity:port-media-keys-schemas into unity:master

[Khurshid Alam]

Khurshid Alam has proposed merging ~khurshid-alam/unity:port-media-keys-schemas into unity:master.

Commit message:
* Port media keys to use com.canonical.unity.settings-daemon. LP: #1842324

* Pick up changes made by Iain Lane from launchpad source

Requested reviews:
  Sebastien Bacher (seb128)
Related bugs:
  Bug #1842324 in unity-settings-daemon (Ubuntu): "Port schemas from gnome-settings-daemon-common to com.canonical.unity.settings-daemon"
  https://bugs.launchpad.net/ubuntu/+source/unity-settings-daemon/+bug/1842324

For more details, see:
https://code.launchpad.net/~khurshid-alam/unity/+git/unity/+merge/372173
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