selftests: mptcp: userspace pm create id 0 subflow

[ Upstream commit b2e2248f ]

This patch adds a selftest to create id 0 subflow. Pass id 0 to the
helper userspace_pm_add_sf() to create id 0 subflow. chk_mptcp_info
shows one subflow but chk_subflows_total shows two subflows in each
namespace.

Reviewed-by: Matthieu Baerts <matttbe@kernel.org>
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <martineau@kernel.org>
Link: https://lore.kernel.org/r/20231128-send-net-next-2023107-v4-5-8d6b94150f6b@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Stable-dep-of: e93681af ("selftests: mptcp: join: cannot rm sf if closed")
Signed-off-by: Sasha Levin <sashal@kernel.org>