tests: check whether IPs are being passed correctly to script when in proxyproto

That is check whether the remote IP passed is other than localhost,
and there is a non-empty IP_REAL_LOCAL.

tests/docker-ocserv/proxy-connectscript

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+if [ "$REASON" = "connect" ];then
+	if test "$IP_REAL" != "127.0.0.1" && test "$IP_REAL" != "::1" && test -n "$IP_REAL_LOCAL";then
+		echo  "$IP_REAL:$IP_REAL_LOCAL" >/tmp/connect/ok
+	fi
+fi
+
+exit 0