IP of persistent instances changes across restarts

[QcFe]

Describe the bug
When a persistent instance is stopped, the corresponding service is deleted.
Upon restart a new service is created, with a different IP address of course.

To Reproduce
Start an instance, note the ip address. Stop it, restart it and note the associated IP is different.

Expected behavior
The IP address is consistent across restarts.

Suggested fix
Skipping service deletion on instance termination.