tests: Enable landlock in test_net_hotplug

Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com>

tests/integration.rs

@@ -5841,6 +5841,10 @@ mod common_parallel {
             .args(["--memory", "size=512M"])
             .args(["--kernel", kernel_path.to_str().unwrap()])
             .args(["--cmdline", DIRECT_KERNEL_BOOT_CMDLINE])
+            .args([
+                "--landlock-rules",
+                format!("path={:?},flags=rw", "/dev/net/tun").as_str(),
+            ])
             .default_disks()
             .capture_output();