debian: Add autopkgtest for testing starting GUI and CLI

Incorporates debian/tests/ changes up to upstream/3.0.0-76-ge634555b61:

 * Add autopkgtest for testing starting GUI
 * Add missing autopkgtest dependencies
 * Use automatic xvfb server number in tests
 * Use GLX extension in autopkgtest, Qt needs it
 * Install at-spi2-core in gui autopkgtest to avoid error messages
 * debian/test/gui: Ignore stderr from wireshark-gtk since upstream deprecated it
 * debian/tests/gui: Redirect stderr to stdout because Lua prints to stderr
 * Stop shipping Wireshark's GTK+ GUI

Change-Id: I840fa17fb5ac2bc7b4fed36c4286ea97742f7369
Reviewed-on: https://code.wireshark.org/review/28519
Reviewed-by: Peter Wu <peter@lekensteyn.nl>
Petri-Dish: Peter Wu <peter@lekensteyn.nl>
Tested-by: Petri Dish Buildbot
Reviewed-by: Anders Broman <a.broman58@gmail.com>

debian/tests/control

@@ -0,0 +1,5 @@
+Tests: tshark
+Depends: tshark
+
+Tests: gui
+Depends: wireshark-qt, xvfb, xauth, at-spi2-core

debian/tests/frame-count.lua

@@ -0,0 +1,17 @@
+do
+    packets = 0;
+    local function init_listener()
+        local tap = Listener.new("frame")
+        function tap.reset()
+            packets = 0;
+        end
+        function tap.packet(pinfo,tvb, ip)
+            packets = packets + 1
+        end
+        function tap.draw()
+           print("Packet count:", packets)
+           os.exit(0)
+        end
+    end
+    init_listener()
+end

debian/tests/gui

@@ -0,0 +1,9 @@
+#!/bin/sh
+# autopkgtest check: Run wireshark GUI to see basic functionality working
+# Author: Balint Reczey <balint@balintreczey.hu>
+
+set -e
+
+xvfb-run --auto-servernum -s '-screen 0 1920x1080x24 +extension GLX' wireshark -Xlua_script:debian/tests/frame-count.lua test/captures/dhcp.pcap 2>&1
+
+echo "run: OK"

debian/tests/tshark

@@ -0,0 +1,8 @@
+#!/bin/sh
+# autopkgtest check: Run tshark to see basic functionality working
+# Author: Balint Reczey <balint@balintreczey.hu>
+
+set -e
+
+tshark --version
+echo "run: OK"