selftests: forwarding: Make vxlan-bridge-1d pass on debug kernels

The ageing time used by the test is too short for debug kernels and
results in entries being aged out prematurely [1].

Fix by increasing the ageing time.

The same change was done for the VLAN-aware version of the test in
commit dfbab740 ("selftests: forwarding: Make vxlan-bridge-1q pass
on debug kernels").

[1]
 # ./vxlan_bridge_1d.sh
 [...]
 # TEST: VXLAN: flood before learning                              [ OK ]
 # TEST: VXLAN: show learned FDB entry                             [ OK ]
 # TEST: VXLAN: learned FDB entry                                  [FAIL]
 # veth3: Expected to capture 0 packets, got 4.
 # RTNETLINK answers: No such file or directory
 # TEST: VXLAN: deletion of learned FDB entry                      [ OK ]
 # TEST: VXLAN: Ageing of learned FDB entry                        [FAIL]
 # veth3: Expected to capture 0 packets, got 2.
 [...]
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240707095458.2870260-1-idosch@nvidia.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/forwarding/vxlan_bridge_1d.sh

@@ -680,9 +680,9 @@ test_learning()
 	local mac=de:ad:be:ef:13:37
 	local dst=192.0.2.100
 
-	# Enable learning on the VxLAN device and set ageing time to 10 seconds
-	ip link set dev br1 type bridge ageing_time 1000
-	ip link set dev vx1 type vxlan ageing 10
+	# Enable learning on the VxLAN device and set ageing time to 30 seconds
+	ip link set dev br1 type bridge ageing_time 3000
+	ip link set dev vx1 type vxlan ageing 30
 	ip link set dev vx1 type vxlan learning
 	reapply_config
 
@@ -740,7 +740,7 @@ test_learning()
 
 	vxlan_flood_test $mac $dst 0 10 0
 
-	sleep 20
+	sleep 60
 
 	bridge fdb show brport vx1 | grep $mac | grep -q self
 	check_fail $?