qapi: Inheriting from object is pointless with Python 3, drop

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200304155932.20452-2-armbru@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>

scripts/qapi/source.py

@@ -13,7 +13,7 @@ import copy
 import sys
 
 
-class QAPISchemaPragma(object):
+class QAPISchemaPragma:
     def __init__(self):
         # Are documentation comments required?
         self.doc_required = False
@@ -23,7 +23,7 @@ class QAPISchemaPragma(object):
         self.name_case_whitelist = []
 
 
-class QAPISourceInfo(object):
+class QAPISourceInfo:
     def __init__(self, fname, line, parent):
         self.fname = fname
         self.line = line