SLING-12086 - FromBasedAuthInterceptor honors system properties (#45)

diff --git a/src/main/java/org/apache/sling/testing/clients/interceptors/FormBasedAuthInterceptor.java b/src/main/java/org/apache/sling/testing/clients/interceptors/FormBasedAuthInterceptor.java
index 5ae26d7..3199b24 100644
--- a/src/main/java/org/apache/sling/testing/clients/interceptors/FormBasedAuthInterceptor.java
+++ b/src/main/java/org/apache/sling/testing/clients/interceptors/FormBasedAuthInterceptor.java
@@ -133,6 +133,7 @@
         loginPost.setEntity(httpEntity);
 
         try (CloseableHttpClient client = HttpClientBuilder.create()
+                .useSystemProperties()
                 .setServiceUnavailableRetryStrategy(new ServerErrorRetryStrategy())
                 .disableRedirectHandling()
                 .build()) {