Abort tests if daemon fails to start

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

script/wrapdocker

@@ -8,9 +8,16 @@ fi
 # delete it so that docker can start.
 rm -rf /var/run/docker.pid
 docker -d $DOCKER_DAEMON_ARGS &>/var/log/docker.log &
+docker_pid=$!
 
 >&2 echo "Waiting for Docker to start..."
 while ! docker ps &>/dev/null; do
+    if ! kill -0 "$docker_pid" &>/dev/null; then
+        >&2 echo "Docker failed to start"
+        cat /var/log/docker.log
+        exit 1
+    fi
+
     sleep 1
 done