[postprocessor] update 'finalize' events

Add 'finalize-error' and 'finalize-success' events that trigger
depending on whether error(s) did or did not happen.

'finalize' itself now always triggers regardless of error status.
(was supposed to have the same behavior as the new 'finalize-success')

test/test_postprocessor.py

@@ -102,10 +102,10 @@ class BasePostprocessorTest(unittest.TestCase):
         pp = postprocessor.find(self.__class__.__name__[:-4].lower())
         return pp(self.job, options)
 
-    def _trigger(self, events=None, *args):
+    def _trigger(self, events=None):
         for event in (events or ("prepare", "file")):
             for callback in self.job.hooks[event]:
-                callback(self.pathfmt, *args)
+                callback(self.pathfmt)
 
 
 class ClassifyTest(BasePostprocessorTest):
@@ -679,7 +679,7 @@ class ZipTest(BasePostprocessorTest):
             self.assertEqual(len(pp.zfile.NameToInfo), 4)
 
         # close file
-        self._trigger(("finalize",), 0)
+        self._trigger(("finalize",))
 
         # reopen to check persistence
         with zipfile.ZipFile(pp.zfile.filename) as file:
@@ -712,7 +712,7 @@ class ZipTest(BasePostprocessorTest):
         self._trigger()
 
         # close file
-        self._trigger(("finalize",), 0)
+        self._trigger(("finalize",))
 
         self.assertEqual(pp.zfile.write.call_count, 3)
         for call in pp.zfile.write.call_args_list: