Add two test files for the unsupported link-layer protocols printer

This is a follow-up to commit 25687e1a312a3bb63a6e8d7f0af0210a615e24a8.

These files come from the Wireshark menagerie:
0031419.pcap (link type 160) and 5632-Raw_D-BUS.cap (first two packets).
diff --git a/tests/TESTLIST b/tests/TESTLIST
index 7566f63..fb15714 100644
--- a/tests/TESTLIST
+++ b/tests/TESTLIST
@@ -810,3 +810,7 @@
 edns-opts       edns-opts.pcap      edns-opts.out
 edns-opts-v     edns-opts.pcap      edns-opts-v.out     -v
 edns-opts-vv    edns-opts.pcap      edns-opts-vv.out    -vv
+
+# unsupported link types
+unsupported-link-type-160 unsupported-link-type-160.pcap unsupported-link-type-160.out
+unsupported-link-type-dbus unsupported-link-type-dbus.pcap unsupported-link-type-dbus.out
diff --git a/tests/unsupported-link-type-160.out b/tests/unsupported-link-type-160.out
new file mode 100644
index 0000000..973e57b
--- /dev/null
+++ b/tests/unsupported-link-type-160.out
@@ -0,0 +1,3 @@
+    1  00:00:00.000000 UNSUPPORTED
+	0x0000:  490c 6209 6923 34e8 efd3 a7bf 4ec0 fd3b  I.b.i#4.....N..;
+	0x0010:  43e0 0b2b 2b2b 2b                        C..++++
diff --git a/tests/unsupported-link-type-160.pcap b/tests/unsupported-link-type-160.pcap
new file mode 100644
index 0000000..d34c60c
--- /dev/null
+++ b/tests/unsupported-link-type-160.pcap
Binary files differ
diff --git a/tests/unsupported-link-type-dbus.out b/tests/unsupported-link-type-dbus.out
new file mode 100644
index 0000000..f833b6a
--- /dev/null
+++ b/tests/unsupported-link-type-dbus.out
@@ -0,0 +1,26 @@
+    1  21:35:34.858486 UNSUPPORTED
+	0x0000:  6c01 0101 9200 0000 1700 0000 7f00 0000  l...............
+	0x0010:  0101 6f00 1500 0000 2f6f 7267 2f66 7265  ..o...../org/fre
+	0x0020:  6564 6573 6b74 6f70 2f44 4275 7300 0000  edesktop/DBus...
+	0x0030:  0601 7300 1400 0000 6f72 672e 6672 6565  ..s.....org.free
+	0x0040:  6465 736b 746f 702e 4442 7573 0000 0000  desktop.DBus....
+	0x0050:  0201 7300 1400 0000 6f72 672e 6672 6565  ..s.....org.free
+	0x0060:  6465 736b 746f 702e 4442 7573 0000 0000  desktop.DBus....
+	0x0070:  0301 7300 0b00 0000 5265 6d6f 7665 4d61  ..s.....RemoveMa
+	0x0080:  7463 6800 0000 0000 0801 6700 0173 0000  tch.......g..s..
+	0x0090:  8d00 0000 7479 7065 3d27 7369 676e 616c  ....type='signal
+	0x00a0:  272c 7365 6e64 6572 3d27 6f72 672e 6672  ',sender='org.fr
+	0x00b0:  6565 6465 736b 746f 702e 4861 6c27 2c70  eedesktop.Hal',p
+	0x00c0:  6174 683d 272f 6f72 672f 6672 6565 6465  ath='/org/freede
+	0x00d0:  736b 746f 702f 4861 6c2f 4d61 6e61 6765  sktop/Hal/Manage
+	0x00e0:  7227 2c69 6e74 6572 6661 6365 3d27 6f72  r',interface='or
+	0x00f0:  672e 6672 6565 6465 736b 746f 702e 4861  g.freedesktop.Ha
+	0x0100:  6c2e 4d61 6e61 6765 7227 2c6d 656d 6265  l.Manager',membe
+	0x0110:  723d 2744 6576 6963 6552 656d 6f76 6564  r='DeviceRemoved
+	0x0120:  2700                                     '.
+    2  21:35:34.859818 UNSUPPORTED
+	0x0000:  6c02 0101 0000 0000 1100 0000 3500 0000  l...........5...
+	0x0010:  0601 7300 0600 0000 3a31 2e31 3131 0000  ..s.....:1.111..
+	0x0020:  0501 7500 1700 0000 0701 7300 1400 0000  ..u.......s.....
+	0x0030:  6f72 672e 6672 6565 6465 736b 746f 702e  org.freedesktop.
+	0x0040:  4442 7573 0000 0000                      DBus....
diff --git a/tests/unsupported-link-type-dbus.pcap b/tests/unsupported-link-type-dbus.pcap
new file mode 100644
index 0000000..6933304
--- /dev/null
+++ b/tests/unsupported-link-type-dbus.pcap
Binary files differ