AppImage packaging

Disabled by default. To kick the the tires:

wget https://github.com/linuxdeploy/linuxdeploy/releases/download/continuous/linuxdeploy-x86_64.AppImage
sudo mv linuxdeploy-x86_64.AppImage /usr/local/bin/linuxdeploy
sudo chmod +x linuxdeploy-x86_64.AppImage

Enable VPP_BUILD_APPIMAGE e.g. in ccmake
make build | make build-release

The vpp AppImage lands in .../install-xxx-native/VPP-x86_64.AppImage. To run it:

./VPP-x86_64.AppImage vpp unix interactive

To run it (as root) and inhale the usual startup.conf:

sudo ./VPP-x86_64.AppImage \${HERE}/bin/vpp -c \${HERE}/etc/vpp/startup.conf

To run vppctl, or any of the usual vpp binaries:

./VPP-x86_64.AppImage vppctl [etc]

Change-Id: Ide8cf4658cbb56f1d36a1ce7fc8f7338f8d38278
Signed-off-by: Dave Barach <dave@barachs.net>
diff --git a/src/tools/appimage/vpp.desktop b/src/tools/appimage/vpp.desktop
new file mode 100644
index 0000000..008965c
--- /dev/null
+++ b/src/tools/appimage/vpp.desktop
@@ -0,0 +1,11 @@
+[Desktop Entry]
+Name=VPP
+Exec=vpp %F
+Icon=vpp
+Type=Application
+Categories=Network;
+Comment=Vector Packet Processor
+Name[en]=VPP
+Terminal=false
+StartupNotify=true
+NoDisplay=false