Issue #984 Improve module listing

Always add a -internal unless internal is explictly mentioned

jetty-start/src/main/java/org/eclipse/jetty/start/StartArgs.java

@@ -752,7 +752,11 @@ public class StartArgs
 
     public List<String> getListModules()
     {
+        if (listModules == null || listModules.contains("internal") || listModules.contains("-internal"))
             return listModules;
+        List<String> modules = new ArrayList<>(listModules);
+        modules.add("-internal");
+        return modules;
     }
 
     public boolean isRun()
@@ -873,7 +877,7 @@ public class StartArgs
         if (arg.equals("--create-files"))
         {
             run = false;
-            download = true;boolean
+            download = true;
             licenseCheckRequired = true;
             return;
         }
@@ -949,7 +953,7 @@ public class StartArgs
         // Module Management
         if ("--list-modules".equals(arg))
         {
-            listModules = Collections.singletonList("-internal");
+            listModules = Collections.emptyList();
             run = false;
             return;
         }

jetty-start/src/main/resources/org/eclipse/jetty/start/usage.txt

@@ -70,7 +70,8 @@ Module Management:
   
   --list-modules=<tag>(,<tag>)*
                    List modules by tag. Use '*' for all tags. Prefix a tag 
-                   with '-' to exclude the tag.
+                   with '-' to exclude the tag.  The special tag "internal"
+                   is always excluded unless it is explicitly included.
                    
   --list-all-modules
                    List all modules.