message: dist: fix dbus configuration
  This tweaks dbus configuration, fixing some mistakes in the ACLs.
  It gets rid of the following dbus-broker warning:
  > Conflicting attributes in /usr/share/dbus-1/system.d/org.coreos.zincati.conf +14
diff: <!DOCTYPE busconfig PUBLIC
  "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
  "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
  +
  <busconfig>
  + <!-- Generally allow access only for introspection -->
  + <policy context="default">
  + <allow send_destination="org.coreos.zincati"
  + send_interface="org.freedesktop.DBus.Introspectable"/>
  + <allow send_destination="org.coreos.zincati"
  + send_interface="org.freedesktop.DBus.Peer"/>
  + <allow send_destination="org.coreos.zincati"
  + send_interface="org.freedesktop.DBus.Properties"/>
  + </policy>
  - <!-- Only user zincati can own the service -->
  + <!-- User 'zincati' is the service owner -->
  <policy user="zincati">
  - <allow own="org.coreos.zincati"/>
  + <allow own_prefix="org.coreos.zincati"/>
  + <allow send_destination="org.coreos.zincati"/>
  + <allow receive_sender="org.coreos.zincati"/>
  </policy>
  - <!-- Only allow root to call into the service -->
  - <policy context="default" user="root">
  + <!-- User 'root' is allowed to call into the service -->
  + <policy user="root">
  <allow send_destination="org.coreos.zincati"/>
  <allow receive_sender="org.coreos.zincati"/>
  </policy>
  