Comment 7 for bug 2030804

Reviewed: https://review.opendev.org/c/openstack/neutron/+/891236
Committed: https://opendev.org/openstack/neutron/commit/16875b5f92731a9cf2d7e819d406bfcc442339f3
Submitter: "Zuul (22348)"
Branch: master

commit 16875b5f92731a9cf2d7e819d406bfcc442339f3
Author: Brian Haley <email address hidden>
Date: Fri Aug 11 17:05:49 2023 -0400

    Catch non-existent entry failures better in ip_lib

    The privileged/agent/linux/ip_lib.py code was not always
    catching "entry does not exist" type errors when deleting
    entries, and most of the callers were not catching it either,
    which could lead to random failures.

    Add code in the IP route, rule and bridge fdb code to catch
    these errors and not raise on them, other exceptions will
    still be raised.

    Also fixed delete_neigh_entry() to not raise when the
    given namespace does not exist to make it like all the
    other calls in the file.

    Added or modified functional tests for above cases.

    Change-Id: I083649ab1b9a9057ee276a7f3ba069eb667db870
    Closes-bug: #2030804