Add spn testing setup

spn/testing/simple/entrypoint.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Get hostname.
+HUBNAME=$HOSTNAME
+if [ "$HUBNAME" = "" ]; then
+  HUBNAME=$(cat /etc/hostname)
+fi
+export HUBNAME
+
+# Read, process and write config.
+cat /opt/shared/config-template.json | sed "s/\$HUBNAME/$HUBNAME/g" > /opt/data/config.json
+
+# Get binary to start.
+BIN=$(ls /opt/ | grep hub)
+
+# Start Hub.
+/opt/$BIN --data /opt/data --log trace --spn-map test --bootstrap-file /opt/shared/bootstrap.dsd --api-address 0.0.0.0:817 --devmode