Force use of IPv4 in native image

To avoid "Address family not supported by protocol" error on some
environment. Caveat: IPv6 only hosts are no longer supported.

Fixes #208

Author: acogoluegnes

Makefile

@@ -34,7 +34,8 @@ native-image: clean ## Build the native image
 	    --initialize-at-build-time=javax.servlet \
 	    --initialize-at-build-time=org.slf4j \
 	    --no-fallback \
-	    -H:IncludeResources="rabbitmq-perf-test.properties"
+	    -H:IncludeResources="rabbitmq-perf-test.properties" \
+	    -Djava.net.preferIPv4Stack=true
 
 .PHONY: docker-image-dev
 docker-image-dev: ## Build Docker image with the local PerfTest version

src/docs/asciidoc/usage-advanced.adoc

@@ -418,7 +418,8 @@ PerfTest native executable has also some limitations:
 
  * link:#supported-metrics[JVM metrics] are not supported
  * it is not possible to configure logging
- * TLS is not supported
+ * TLS is not supported (this is likely to be fixed someday)
+ * IPv6 only hosts are not supported (this is likely to be fixed someday)
 
 [WARNING]
 ====