Unity Settings Daemon

Merge proposals dependent on lp://staging/~kaihengfeng/unity-settings-daemon/16.04-sru-fix-1571640

  1. 16.04-sru-fix-1571640
  2. Dependent merge proposals

lp://staging/~kaihengfeng/unity-settings-daemon/16.04-sru-fix-1571640 has no merge proposals.