SteamOS: Use new currentBuildID in addition to currentVersion.

Jeremy Whitingrequested to merge
work/whiting/steamos-cherry-pick into master

Updated xml for dbus interface from atomupd-daemon branch.

Updated code to use both version and build id values.

Also changed gui to show version - buildid instead of version buildid.

(cherry picked from commit a19a44e7)

Edited by Jeremy Whiting

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