Fix race condition in ensemble builder (#831)
Fix race condition in ensemble builder (#831)

* Fix race condition in ensemble builder

Due to a recent change, the ensemble builder can load
gzipped files with the ending .npy.gz. The glob statement
to find these files is `.npy*`, which can also find
lock files like `.npy.lock`, which must not be confused
with prediction files.

* Update ensemble_builder.py
automl/auto-sklearn,automl/auto-sklearn