internal/uevent: consume kernel-originated events

These are not possible to cover outside integration vm. Extreme care is required when dealing with this method, so keep it simple.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/uevent/uevent_test.go

@@ -138,6 +138,10 @@ func TestErrors(t *testing.T) {
 			Data: "\x00",
 			Kind: 0xbad,
 		}, `section "" is invalid`},
+
+		{"BadPortError", &uevent.BadPortError{
+			Pid: 1,
+		}, "unexpected message from port id 1 on NETLINK_KOBJECT_UEVENT"},
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {