Run the test script: F59932955
Some basic tests:
# rename physical interfaces
# rename interface that its cloner do not have `IFC_F_AUTOUNIT` flag, such as epair(4)
# rename interface that its cloner have IFC_F_AUTOUNIT` flag, such as bridge(4)
# move interface to another vnet, and move back
```
# ifconfig bridge0 create name br0
br0
# ifconfig bridge0 create name br1
br1
# ifconfig br1 name bridge0
bridge0
# ifconfig bridge create
bridge0
# ifconfig br0 destroy
# ifconfig bridge0 destroy
# ifconfig bridge create name br2
br2
# kldunload if_bridge
```