Comment 24 for bug 2054324

Reviewed: https://review.opendev.org/c/openstack/neutron/+/911605
Committed: https://opendev.org/openstack/neutron/commit/10af328885ac0f85f161c454dd53463cee57bb23
Submitter: "Zuul (22348)"
Branch: stable/2023.1

commit 10af328885ac0f85f161c454dd53463cee57bb23
Author: Brian Haley <email address hidden>
Date: Tue Mar 5 11:59:05 2024 -0500

    Use the system-dependent string for IP protocol 4

    iptables-save uses a system-dependent value, usually that
    found in /etc/protocols, when 'ipip' is given as the
    security group protocol. The intent is to always use the
    string value for IP protocol '4', as iptables-save has no
    '-n' flag to print values numerically.

    This updates a previous change (793dfb04d) that hard-coded
    that string to 'ipencap', which broke CentOS/Fedora, which
    uses 'ipv4'.

    For this reason we cannot hard-code anything in neutron-lib,
    this needs to be added dynamically, so this one-line change
    needs to stay here, and effectively closes the bug.

    Closes-bug: #2054324
    Change-Id: Ic40b539c9ef5cfa4cbbd6575e19e653342e8342b
    (cherry picked from commit cd1d191e335dca707ac9324fd81e642cb453a6cf)