Preserve order in HTTP parameter Map

The HttpUtil.getTableMap method creates and returns a copy of a Map.
This commit changes the new Map instance from a HashMap to a
LinkedHashMap in order to preserve the iteration order of the original
Map being copied.
Issue: nextgenhealthcare/connect#6276
Original-pull-request: nextgenhealthcare/connect#6296
Signed-off-by: Tony Germano <tony@germano.name>

Author: cmcquillen

server/src/com/mirth/connect/util/HttpUtil.java

@@ -11,7 +11,7 @@
 
 importjava.nio.charset.Charset;
 importjava.util.ArrayList;
-importjava.util.HashMap;
+importjava.util.LinkedHashMap;
 importjava.util.List;
 importjava.util.Map;
 importjava.util.Map.Entry;
@@ -104,7 +104,7 @@ public static Map<String, List<String>> getTableMap(boolean useVariable, String
  }
 
 publicstaticMap<String, List<String>> getTableMap(StringmapVariable, MessageMapsmessageMaps, ConnectorMessageconnectorMessage) {
-Map<String, List<String>> map = newHashMap<String, List<String>>();
+Map<String, List<String>> map = newLinkedHashMap<String, List<String>>();
 
 try {
 Map<?, ?> source = (Map<?, ?>) messageMaps.get(mapVariable, connectorMessage);