dbus: add nm_dbus_manager_get_dbus_connection() helper
The NMDBusManager owns a reference to the system bus. Expose it, so we can use it. Note that g_bus_get() -- as alternative to get the systembus singleton -- is asynchronous, and g_bus_get_sync() has an API that makes one wonder what it does. Since we already have a reference to the connection object we want to use, expose it.
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