ovsdbapp - filedescriptor out of range in select()

[Freerk-Ole Zakfeld]

After a few months of operating the octavia API with constant workload, it suddenly stops working. The log suggests leaking file descriptors.

```
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection Traceback (most recent call last):
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection File "/var/lib/kolla/venv/lib/python3.10/site-packages/ovsdbapp/backend/ovs_idl/connection.py", line 105, in run
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection self.poller.block()
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection File "/usr/lib/python3/dist-packages/ovs/poller.py", line 231, in block
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection events = self.poll.poll(self.timeout)
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection File "/usr/lib/python3/dist-packages/ovs/poller.py", line 137, in poll
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection rlist, wlist, xlist = select.select(self.rlist,
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection ValueError: filedescriptor out of range in select()
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection
2025-01-08 11:02:30.948 24 ERROR ovsdbapp.backend.ovs_idl.connection [-] filedescriptor out of range in select(): ValueError: filedescriptor out of range in select()
```

This might be similar to https://bugs.launchpad.net/neutron/+bug/2063043

I'm running octavia-api stable release 20240909 (Caracal)

[Freerk-Ole Zakfeld (freerkzakfeld)]

Additional Context in similar bug report for octavia/ovn at https://github.com/osism/issues/issues/959