dbus-1(-x11): assure that /var/lib/dbus/machine-id and /etc/machine-id are the same

This update fixes the following issue with dbus-1(-x11):
- bnc#857377: Try hard to assure that /var/lib/dbus/machine-id and /etc/machine-id are the same
- Make sure that dbus-1 requires libdbus-1-3 during %post (detected when built against DBus-less systemd 209

Fixed bugs
bnc#857377
/etc/machine-id and /var/lib/dbus/machine-id differ
Selected Binaries
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