Improve message of XMPPErrorException

by including the XMPP entity which send the XMPP error reply to us.

Also cleanup the no longer used constructors.

smack-extensions/src/main/java/org/jivesoftware/smackx/commands/AdHocCommandManager.java

@@ -615,6 +615,7 @@ public final class AdHocCommandManager extends Manager {
      * @return the command instance to execute.
      * @throws XMPPErrorException if there is problem creating the new instance.
      */
+    @SuppressWarnings("deprecation")
     private LocalCommand newInstanceOfCmd(String commandNode, String sessionID) throws XMPPErrorException
     {
         AdHocCommandInfo commandInfo = commands.get(commandNode);