selftests/net: ensure mptcp is enabled in netns

JIRA: https://issues.redhat.com/browse/RHEL-80379
Upstream Status: net-next.git commit 0f58804

commit 0f58804
Author: Hangbin Liu <liuhangbin@gmail.com>
Date:   Mon Feb 24 09:40:13 2025 +0000

    selftests/net: ensure mptcp is enabled in netns

    Some distributions may not enable MPTCP by default. All other MPTCP tests
    source mptcp_lib.sh to ensure MPTCP is enabled before testing. However,
    the ip_local_port_range test is the only one that does not include this
    step.

    Let's also ensure MPTCP is enabled in netns for ip_local_port_range so
    that it passes on all distributions.

    Suggested-by: Davide Caratti <dcaratti@redhat.com>
    Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
    Acked-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
    Link: https://patch.msgid.link/20250224094013.13159-1-liuhangbin@gmail.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Hangbin Liu <haliu@redhat.com>

Author: Hangbin Liu

tools/testing/selftests/net/ip_local_port_range.sh

@@ -2,4 +2,6 @@
 # SPDX-License-Identifier: GPL-2.0
 
 ./in_netns.sh \
-  sh -c 'sysctl -q -w net.ipv4.ip_local_port_range="40000 49999" && ./ip_local_port_range'
+  sh -c 'sysctl -q -w net.mptcp.enabled=1 && \
+         sysctl -q -w net.ipv4.ip_local_port_range="40000 49999" && \
+         ./ip_local_port_range'