Copy properties map so as to not modify it when merging with action-s…

…pecific properties

src/main/java/com/etsy/arbiter/OozieWorkflowGenerator.java

@@ -203,7 +203,7 @@ private void createActionElement(Action action, DirectedAcyclicGraph<Action, Def
 
         // There is an outer action tag and an inner tag corresponding to the action type
         Map<String, List<String>> interpolated = NamedArgumentInterpolator.interpolate(type.getDefaultArgs(), action.getNamedArgs(), type.getDefaultInterpolations(), action.getPositionalArgs());
-        Map<String, String> mergedConfigurationProperties = type.getProperties();
+        Map<String, String> mergedConfigurationProperties = new HashMap<>(type.getProperties());
         if (action.getConfigurationProperties() != null) {
             mergedConfigurationProperties.putAll(action.getConfigurationProperties());
         }