Add retries to object store support?

[kellrott]

Failure in communication with swift storage resulted in pipeline failure.
Perhaps add re-try to compensate

 File "./run_training.py", line 68, in <module>
    scores = ts.run(do_learning, "/data/feature.matrix", "/data/label.matrix", "/data/adj.matrix", list(gene_set))
  File "build/bdist.macosx-10.10-intel/egg/tesseract/tesseract.py", line 160, in run
  File "build/bdist.macosx-10.10-intel/egg/tesseract/filestore.py", line 199, in upload
  File "/Users/ellrott/workspaces/nci-cptac-dream/venv/lib/python2.7/site-packages/apache_libcloud-2.2.1-py2.7.egg/libcloud/storage/drivers/cloudfiles.py", line 435, in upload_object
    verify_hash=verify_hash, headers=headers)
  File "/Users/ellrott/workspaces/nci-cptac-dream/venv/lib/python2.7/site-packages/apache_libcloud-2.2.1-py2.7.egg/libcloud/storage/drivers/cloudfiles.py", line 784, in _put_object
    driver=self)
libcloud.common.types.LibcloudError: <LibcloudError in <libcloud.storage.drivers.cloudfiles.OpenStackSwiftStorageDriver object at 0x112646410> "Server didn't return etag">