[Rpm-maint] [rpm-software-management/rpm] Add dbus-announce plugin (#1255)

[Florian Festi]

OK, now there should be all issues raised so far being addressed. The plugin now only gives a warning via `rpmlog` if the connection to dbus cannot be obtained. From my POV this can be merged by squashing all commit into the first one - or I can squash them first if that is prefered.

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