Do not remove exception from result, hide output.

This allows all callback plugins access to exception details.

lib/ansible/plugins/callback/oneline.py

@@ -56,9 +56,6 @@ class CallbackModule(CallbackBase):
             else:
                 self._display.display(msg, color=C.COLOR_ERROR)
 
-            # finally, remove the exception from the result so it's not shown every time
-            del result._result['exception']
-
         self._display.display("%s | FAILED! => %s" % (result._host.get_name(), self._dump_results(result._result, indent=0).replace('\n','')), color=C.COLOR_ERROR)
 
     def v2_runner_on_ok(self, result):