packetblaster: Added simple selftest.sh

This is a really simple test case that runs packetblaster on
$INTEL_TEST_INTEL10G_PCIDEVA (if defined) and just makes sure that it
runs for at least 5 seconds i.e. doesn't die on startup.

src/program/packetblaster/selftest.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+echo "selftest: packetblaster"
+if [ -z "${SNABB_TEST_INTEL10G_PCIDEVA}" ]; then
+    echo "selftest: skipping test - SNABB_TEST_INTEL10G_PCIDEVA undefined"
+    exit 43
+fi
+
+# Simple test: Just make sure packetblaster runs for a period of time
+# (doesn't crash on startup).
+timeout 5 ./snabb packetblaster replay program/packetblaster/selftest.pcap \
+                                       ${SNABB_TEST_INTEL10G_PCIDEVA}
+status=$?
+if [ $status != 124 ]; then
+    echo "Error: expected timeout (124) but got ${status}"
+    exit 1
+fi
+
+echo "selftest: ok"