Add a DHCPREQUEST from a DHCP relay to the test dataset.

dhcp/testdata/dhcp.parsed

@@ -60,3 +60,20 @@ DHCPOFFER
     58: []byte{0x0, 0x0, 0x7, 0x8}
     59: []byte{0x0, 0x0, 0xc, 0x4e}
 ======
+DHCPREQUEST
+  "R\xcf\xf0\a"
+  Unicast
+  MAC: 00:24:d7:ba:0b:20
+  ClientIP: 0.0.0.0
+  YourIP: 0.0.0.0
+  ServerIP: 0.0.0.0
+  RelayIP: 192.168.40.1
+
+  BootServerName: 
+  BootFilename: 
+
+  Options:
+    12: []byte{0x73, 0x69, 0x62, 0x65, 0x61, 0x6c}
+    50: []byte{0xc0, 0xa8, 0x28, 0x4}
+    55: []byte{0x1, 0x1c, 0x2, 0x3, 0xf, 0x6, 0x77, 0xc, 0x2c, 0x2f, 0x1a, 0x79, 0x2a}
+======