use _ for env

Author: BCaxelbecker

src/test/java/org/arangodb/objectmapper/test/BaseTestCase.java

@@ -115,7 +115,7 @@ private Properties loadPropertiesFromFile() {
 
 			props.forEach((key, val) -> {
 
-				String systemProp = System.getProperty(key.toString());
+				String systemProp = System.getProperty(key.toString().replace(".", "_"));
 
 				if(systemProp != null && systemProp.equals(val) == false) {
 					LOG.info("Found System Property for " + key + " with Value " + systemProp);