text: Title: Stress test repeated construction and fitting from same process
  Body: From issue #1302, it appears autosklearn is a bit unstable when run many times in the same script, i.e. in a for loop.
  
  ```python
  for i in range(400):
      automodel = AutoSklearn(full_resources)
      automodel.fit(x, y)
  ```
  
  We currently have no test for this and it would be good to see if we can reproduce the same `connection refused` error.