[parser] fix typo, the add on are named ppfaddon instead of pypushflowaddon

scheme/parser.py

@@ -56,14 +56,14 @@ class Parser(object):
         """
         aliases = {}
         try:
-            import pypushflowaddon
+            import ppfaddon
         except ImportError:
             return aliases
         else:
             import pkgutil
-            for importer, modname, ispkg in pkgutil.iter_modules(pypushflowaddon.__path__):
+            for importer, modname, ispkg in pkgutil.iter_modules(ppfaddon.__path__):
                 try:
-                    mod_name = '.'.join((pypushflowaddon.__name__, modname, 'aliases'))
+                    mod_name = '.'.join((ppfaddon.__name__, modname, 'aliases'))
                     module = importlib.import_module(mod_name)
                 except ImportError:
                     _logger.warning(modname + ' does not fit the add-on design, skip it')