This test leaves a lot of interfaces when it finishes, making other tests slower due to long time of loading scapy from `pft_ping.py` when more interfaces are present. When both sides of epair are assigned to jails, they are both removed from `created_interfaces.lst` and thus won't be removed during cleanup from this file. An interface assigned to jail is stored in `created_jails.lst` but if it is renamed, it won't be cleaned up either. Furthermore this test uses identical names for multiple interfaces across multiple jails which after destroying those jails adds to overall confusion.
To address this issue a new function is provided for renaming interfaces in jails and storing their new names in `created_jails.lst` for deletion during cleanup.
I was also unable to replicate the issue of "long cleanup which may lead to a timeout". I've restored normal cleanup function, it worked properly multiple times.
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