selftests: test_bridge_neigh_suppress.sh: Fix failures due to duplicate MAC

When creating the topology for the test, three veth pairs are created in
the initial network namespace before being moved to one of the network
namespaces created by the test.

On systems where systemd-udev uses MACAddressPolicy=persistent (default
since systemd version 242), this will result in some net devices having
the same MAC address since they were created with the same name in the
initial network namespace. In turn, this leads to arping / ndisc6
failing since packets are dropped by the bridge's loopback filter.

Fix by creating each net device in the correct network namespace instead
of moving it there from the initial network namespace.
Reported-by: Jakub Kicinski <kuba@kernel.org>
Closes: https://lore.kernel.org/netdev/20240426074015.251854d4@kernel.org/
Fixes: 7648ac72 ("selftests: net: Add bridge neighbor suppression test")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20240507113033.1732534-1-idosch@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/test_bridge_neigh_suppress.sh

@@ -154,17 +154,9 @@ setup_topo()
 		setup_topo_ns $ns
 	done
 
-	ip link add name veth0 type veth peer name veth1
-	ip link set dev veth0 netns $h1 name eth0
-	ip link set dev veth1 netns $sw1 name swp1
-
-	ip link add name veth0 type veth peer name veth1
-	ip link set dev veth0 netns $sw1 name veth0
-	ip link set dev veth1 netns $sw2 name veth0
-
-	ip link add name veth0 type veth peer name veth1
-	ip link set dev veth0 netns $h2 name eth0
-	ip link set dev veth1 netns $sw2 name swp1
+	ip -n $h1 link add name eth0 type veth peer name swp1 netns $sw1
+	ip -n $sw1 link add name veth0 type veth peer name veth0 netns $sw2
+	ip -n $h2 link add name eth0 type veth peer name swp1 netns $sw2
 }
 
 setup_host_common()