l2tp: stable backport for 10.2 phase 1

Guillaume Naultrequested to merge
gnault/centos-stream-10:rhel-115595 into main

JIRA: https://issues.redhat.com/browse/RHEL-115595 Upstream Status: linux.git

Align PPP/L2TP code with upstream.

Signed-off-by: Guillaume Nault gnault@redhat.com

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