selftests: net: use slowwait to make sure IPv6 setup finished

JIRA: https://issues.redhat.com/browse/RHEL-83477
Upstream Status: net-next.git commit 9486703

commit 9486703
Author: Hangbin Liu <liuhangbin@gmail.com>
Date:   Tue Jun 17 10:51:00 2025 +0000

    selftests: net: use slowwait to make sure IPv6 setup finished

    Sometimes the vxlan vnifiltering test failed on slow machines due to
    network setup not finished. e.g.

      TEST: VM connectivity over vnifiltering vxlan (ipv4 default rdst)   [ OK ]
      TEST: VM connectivity over vnifiltering vxlan (ipv6 default rdst)   [FAIL]

    Let's use slowwait to make sure the connection is finished.

    Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
    Reviewed-by: Simon Horman <horms@kernel.org>
    Link: https://patch.msgid.link/20250617105101.433718-3-liuhangbin@gmail.com
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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

Author: Hangbin Liu

tools/testing/selftests/net/test_vxlan_vnifiltering.sh

@@ -146,18 +146,17 @@ run_cmd()
 }
 
 check_hv_connectivity() {
-	ip netns exec $hv_1 ping -c 1 -W 1 $1 &>/dev/null
-	sleep 1
-	ip netns exec $hv_1 ping -c 1 -W 1 $2 &>/dev/null
+	slowwait 5 ip netns exec $hv_1 ping -c 1 -W 1 $1 &>/dev/null
+	slowwait 5 ip netns exec $hv_1 ping -c 1 -W 1 $2 &>/dev/null
 
 	return $?
 }
 
 check_vm_connectivity() {
-	run_cmd "ip netns exec $vm_11 ping -c 1 -W 1 10.0.10.12"
+	slowwait 5 run_cmd "ip netns exec $vm_11 ping -c 1 -W 1 10.0.10.12"
 	log_test $? 0 "VM connectivity over $1 (ipv4 default rdst)"
 
-	run_cmd "ip netns exec $vm_21 ping -c 1 -W 1 10.0.10.22"
+	slowwait 5 run_cmd "ip netns exec $vm_21 ping -c 1 -W 1 10.0.10.22"
 	log_test $? 0 "VM connectivity over $1 (ipv6 default rdst)"
 }