rename and rename_last does not clean up old availability topic

[svh1985]

Is your feature request related to a problem? Please describe

I think the rename and rename_last are not complete; I would expect z2m to clean up the retained messages for its previous name.

Currently when use rename_last or rename 0x001788234200589e to Kitchen Lamp, the old avalabiltity topic remains there (retained) with value zigbee2mqtt/0x001788234200589e/availability online

After some testing, it also seems that the new device does not get the availability topic.

Describe the solution you'd like

I would expect z2m to clean up the old topic or at least set the availability to offline

Describe alternatives you've considered

Currently, we have to manually remove the retained messages with an MQTT client.

[Koenkk]

Fixed!

Changes will be available in the latest dev branch in a few hours (https://www.zigbee2mqtt.io/how_tos/how-to-switch-to-dev-branch.html)