test-network: also set custom altternative name for netdevsim interface

Due to the bug in kernel 6.9 caused by
https://github.com/torvalds/linux/commit/8debcf5832c3e8a6baaea27c75ad8a6ba5077beb,
the net_id udev builtin does not work for netdevsim interface.
So, eni99np1 cannot be used with kernel 6.9 anymore.

Workaround for #32910.

test/test-network/conf/25-netdevsim.link

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+[Match]
+Driver=netdevsim
+
+[Link]
+NamePolicy=keep kernel database onboard slot path
+AlternativeNamesPolicy=database onboard slot path mac
+# Also set a fixed name. Workaround for bug in kernel 6.9:
+# https://github.com/torvalds/linux/commit/8debcf5832c3e8a6baaea27c75ad8a6ba5077beb
+AlternativeName=sim99
+MACAddressPolicy=persistent

test/test-network/conf/25-sriov-udev.network

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 [Match]
-Name=eni99np1
+Name=sim99
 
 [Network]
 Address=192.168.100.100/24

test/test-network/conf/25-sriov.link

@@ -5,6 +5,9 @@ Driver=netdevsim
 [Link]
 NamePolicy=keep kernel database onboard slot path
 AlternativeNamesPolicy=database onboard slot path mac
+# Also set a fixed name. Workaround for bug in kernel 6.9:
+# https://github.com/torvalds/linux/commit/8debcf5832c3e8a6baaea27c75ad8a6ba5077beb
+AlternativeName=sim99
 MACAddressPolicy=persistent
 
 [SR-IOV]

test/test-network/conf/25-sriov.network

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 [Match]
-Name=eni99np1
+Name=sim99
 
 [Network]
 Address=192.168.100.100/24

test/test-network/systemd-networkd-tests.py

@@ -562,7 +562,7 @@ def link_exists(*links):
     return True
 
 def link_resolve(link):
-    return check_output(f'ip link show {link}').split(':')[1].strip()
+    return check_output(f'ip link show {link}').split(':')[1].strip().split('@')[0]
 
 def remove_link(*links, protect=False):
     for link in links:
@@ -5282,14 +5282,14 @@ class NetworkdSRIOVTests(unittest.TestCase, Utilities):
 
     @expectedFailureIfNetdevsimWithSRIOVIsNotAvailable()
     def test_sriov(self):
-        copy_network_unit('25-default.link', '25-sriov.network')
+        copy_network_unit('25-netdevsim.link', '25-sriov.network')
 
         self.setup_netdevsim(num_vfs=3)
 
         start_networkd()
-        self.wait_online('eni99np1:routable')
+        self.wait_online('sim99:routable')
 
-        output = check_output('ip link show dev eni99np1')
+        output = check_output('ip link show dev sim99')
         print(output)
         self.assertRegex(output,
                          'vf 0 .*00:11:22:33:44:55.*vlan 5, qos 1, vlan protocol 802.1ad, spoof checking on, link-state enable, trust on, query_rss on\n *'
@@ -5304,12 +5304,12 @@ class NetworkdSRIOVTests(unittest.TestCase, Utilities):
         self.setup_netdevsim()
 
         start_networkd()
-        self.wait_online('eni99np1:routable')
+        self.wait_online('sim99:routable')
 
-        # the name eni99np1 may be an alternative name.
-        ifname = link_resolve('eni99np1')
+        # The name sim99 is an alternative name, and cannot be used by udevadm below.
+        ifname = link_resolve('sim99')
 
-        output = check_output('ip link show dev eni99np1')
+        output = check_output('ip link show dev sim99')
         print(output)
         self.assertRegex(output,
                          'vf 0 .*00:11:22:33:44:55.*vlan 5, qos 1, vlan protocol 802.1ad, spoof checking on, link-state enable, trust on, query_rss on\n *'
@@ -5325,7 +5325,7 @@ class NetworkdSRIOVTests(unittest.TestCase, Utilities):
         udevadm_reload()
         udevadm_trigger(f'/sys/devices/netdevsim99/net/{ifname}')
 
-        output = check_output('ip link show dev eni99np1')
+        output = check_output('ip link show dev sim99')
         print(output)
         self.assertRegex(output,
                          'vf 0 .*00:11:22:33:44:55.*vlan 5, qos 1, vlan protocol 802.1ad, spoof checking on, link-state enable, trust on, query_rss on\n *'
@@ -5341,7 +5341,7 @@ class NetworkdSRIOVTests(unittest.TestCase, Utilities):
         udevadm_reload()
         udevadm_trigger(f'/sys/devices/netdevsim99/net/{ifname}')
 
-        output = check_output('ip link show dev eni99np1')
+        output = check_output('ip link show dev sim99')
         print(output)
         self.assertRegex(output,
                          'vf 0 .*00:11:22:33:44:55.*vlan 5, qos 1, vlan protocol 802.1ad, spoof checking on, link-state enable, trust on, query_rss on\n *'
@@ -5357,7 +5357,7 @@ class NetworkdSRIOVTests(unittest.TestCase, Utilities):
         udevadm_reload()
         udevadm_trigger(f'/sys/devices/netdevsim99/net/{ifname}')
 
-        output = check_output('ip link show dev eni99np1')
+        output = check_output('ip link show dev sim99')
         print(output)
         self.assertRegex(output,
                          'vf 0 .*00:11:22:33:44:55.*vlan 5, qos 1, vlan protocol 802.1ad, spoof checking on, link-state enable, trust on, query_rss on\n *'
@@ -5373,7 +5373,7 @@ class NetworkdSRIOVTests(unittest.TestCase, Utilities):
         udevadm_reload()
         udevadm_trigger(f'/sys/devices/netdevsim99/net/{ifname}')
 
-        output = check_output('ip link show dev eni99np1')
+        output = check_output('ip link show dev sim99')
         print(output)
         self.assertRegex(output,
                          'vf 0 .*00:11:22:33:44:55.*vlan 5, qos 1, vlan protocol 802.1ad, spoof checking on, link-state enable, trust on, query_rss on\n *'