Add haproxy to benchmarking tool

Adding as a proxy - a middle actor.
Currently adding only for apache.

Support all the encryption modes for haproxy:
- client to proxy
- proxy to server
- client to server
- pure http without encryption

Currently adding it only for openssl-master crypto backend.

Signed-off-by: Norbert Pocs <norbertp@openssl.org>

Author: jogme

bench-scripts/apache_bench.sh

@@ -844,6 +844,16 @@ function run_test {
 	#
 	# generate URLs for sewage
 	#
+	# The different modes for haproxy are:
+	# no: client - server
+	# no-ssl: client -http- haproxy -http- server
+	# server: client -https- haproxy -http- server
+	# client: client -http- haproxy -https- server
+	# both: client -https- haproxy -https- server
+	#
+	# Otherwise said, haproxy is a client when it encrypts the outgoing encryption;
+	# or it's client side.
+	#
 	rm -f siege_urls.txt
 	for i in `ls -1 ${HTDOCS}/*.txt` ; do
 		if [[ "${HAPROXY}" = "no" ]] ; then