test: Migrate from old test scripts

* Switch to upstream Docker inspired test suite.
* Major disadvantage:  Seeing the stdout log. To be researched later.

test/client/wait-for-connect.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+set -e
+
+[ -n "${DEBUG+x}" ] && set -x
+
+OPENVPN_CONFIG=${1:-/client/config.ovpn}
+
+# Run in background, rely on bash for job management
+openvpn --config "$OPENVPN_CONFIG" --management 127.0.0.1 9999 &
+
+# Spin waiting for interface to exist signifying connection
+timeout=10
+for i in $(seq $timeout); do
+
+    # Break when connected
+    #echo state | busybox nc 127.0.0.1 9999 | grep -q "CONNECTED,SUCCESS" && break;
+
+    # Bash magic for tcp sockets
+    if exec 3<>/dev/tcp/127.0.0.1/9999; then
+        # Consume all header input
+        while read -t 0.1 <&3; do true; done
+        echo "state" >&3
+        read -t 1 <&3
+        echo -n $REPLY | grep -q "CONNECTED,SUCCESS" && break || true
+        exec 3>&-
+    fi
+
+    # Else sleep
+    sleep 1
+done
+
+if [ $i -ge $timeout ]; then
+    echo "Error starting OpenVPN, i=$i, exiting."
+    exit 2;
+fi
+
+# The show is over.
+kill %1