ARIA-416 Providing handlers to logging_handlers only adds handles ins…

…tead of replacing

aria/orchestrator/context/common.py

@@ -114,15 +114,20 @@ def __repr__(self):
             .format(name=self.__class__.__name__, self=self))
 
     @contextmanager
-    def logging_handlers(self, handlers=None):
+    def logging_handlers(self, handlers):
+        original_handlers = self.logger.handlers
         handlers = handlers or []
         try:
             for handler in handlers:
                 self.logger.addHandler(handler)
+            for handler in original_handlers:
+                self.logger.removeHandler(handler)
             yield self.logger
         finally:
-            for handler in handlers:
+            for handler in self.logger.handlers[:]:
                 self.logger.removeHandler(handler)
+            for handler in original_handlers:
+                self.logger.addHandler(handler)
 
     @property
     def model(self):