implementing patient_move for retrying around shutil.copy2, which fails in NFS is underload because NFS says "file is not there" when it really is.
implementing patient_move for retrying around shutil.copy2, which
fails in NFS is underload because NFS says "file is not there" when it really is.

trec-kba/streamcorpus-pipeline,trec-kba/streamcorpus-pipeline,trec-kba/streamcorpus-pipeline