Change the following to replace Python 2 code with Python 3:

1) Replace the deprecated unit test method.
2) Wraps filter usage in a list call.
3) Converts the old metaclass syntax to new.
4) Use range instead of xrange method.
5) Change Unicode to str.
6) Several other transformations.
7) Fixed change password test cases.
8) Use simplejson instead of plain JSON.

web/pgadmin/tools/debugger/__init__.py

@@ -1269,7 +1269,7 @@ def messages(trans_id):
             # From the above message we need to find out port number
             # as "7" so below logic will find 7 as port number
             # and attach listened to that port number
-            tmp_list = list(filter(lambda x: 'PLDBGBREAK' in x, notify))
+            tmp_list = [x for x in notify if 'PLDBGBREAK' in x]
             if len(tmp_list) > 0:
                 port_number = re.search(r'\d+', tmp_list[0])
                 if port_number is not None: