net-test: V VTS - enforce minimum non-buggy LTS kernel versions.

This is driven by the desire to correctly support
 - XFRM_MIGRATE, which requires 4.19.236+ 5.4.186+ 5.10.107+ 5.15.30+
   see xfrm_tunnel_test.py:55 HasXfrmMigrateFixes()
 - IPV6 UDP ENCAP, which requires 5.10.108+ 5.15.31+
   see xfrm_test.py:488 testIPv6UDPEncapRecvTransport() & testIPv6UDPEncapRecvTunnel()
 - ACCEPT_MIN_RA_LFT, which requires 5.10.199+ 5.15.136+ 6.1.57+
   see multinetwork_base.py:61 HAVE_ACCEPT_RA_MIN_LFT

For now we leave those tests as is (with kernel version checks that
are now effectively required to be true), as this will result in
a cleaner failure message.

Bug: 325828213
Test: TreeHugger, manually in UML on 6.1-V
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I93a100d0032d2943c490b926614cfbb599dd43eb
diff --git a/net/test/kernel_feature_test.py b/net/test/kernel_feature_test.py
index 3f2c283..f8b4de0 100755
--- a/net/test/kernel_feature_test.py
+++ b/net/test/kernel_feature_test.py
@@ -73,6 +73,13 @@
     with net_test.RunAsUidGid(12345, self.AID_NET_RAW):
       self.assertRaisesErrno(errno.EPERM, socket, AF_PACKET, SOCK_RAW, 0)
 
+  def testMinRequiredKernelVersion(self):
+    self.assertTrue(net_test.KernelAtLeast([(4, 19, 236),
+                                            (5, 4, 186),
+                                            (5, 10, 199),
+                                            (5, 15, 136),
+                                            (6, 1, 57)]))
+
 
 if __name__ == "__main__":
   unittest.main()