[connman] Explicitly set device managed status for notifications. JB#43928
This commit changes the device status notify by removing the managed boolean from each notify call. Instead, the managed state is to be set explicitely for the device using connman_device_set_managed(). The managed state can be checked with connman_device_get_managed(). When managed state changes a device status change notification is sent without any change in the device status (no transition). This is to indicate each registered component about the managed state change only. When the on/off status change is done the transition is indicated (connman_device_has_status_changed_to()). If the managed state changes when there is no status set for the device no notification will be sent. If status does not change connman_device_status_notify() does not forward notify. Identical status to previous is sent only when the managed status is changed. Developer mode plugin sets managed state to false when a appropriate device comes up. This state is not changed when removing the device. Ethernet plugin is changed to ignore status changes in managed mode. If the device is managed then only in case the device status is off it needs to be processed in order to remove the device from list. If there is no change and device is not managed, notify is ignored. Similarly to ethernet plugin the firewall reacts only to non-managed notifies with status change and in case the device is managed and is put off. Tests are also updated to use the new managed approach instead of passing it along with notifies.
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