Package conflicts

[nhammond]

This error shows up during the Docker build:

pynacl 1.3.0 has requirement cffi>=1.4.1, but you'll have cffi 0.8.6 which is incompatible.
eventlet 0.24.1 has requirement six>=1.10.0, but you'll have six 1.8.0 which is incompatible.
google-apitools 0.5.26 has requirement six>=1.9.0, but you'll have six 1.8.0 which is incompatible.
elasticsearch-curator 5.6.0 has requirement six>=1.11.0, but you'll have six 1.8.0 which is incompatible.
bcrypt 3.1.6 has requirement cffi>=1.1, but you'll have cffi 0.8.6 which is incompatible.
paramiko 2.4.2 has requirement cryptography>=1.5, but you'll have cryptography 0.6.1 which is incompatible.

Then run-unit-tests.sh gives this error:

+ loom test unit
Traceback (most recent call last):
  File "/usr/local/bin/loom", line 7, in <module>
    from loomengine.main import main
  File "/usr/local/lib/python2.7/dist-packages/loomengine/main.py", line 11, in <module>
    from loomengine import bulk_import
  File "/usr/local/lib/python2.7/dist-packages/loomengine/bulk_import.py", line 10, in <module>
    from loomengine_utils.import_manager import ImportManager
  File "/usr/local/lib/python2.7/dist-packages/loomengine_utils/import_manager.py", line 8, in <module>
    from .file_utils import File, FileSet, parse_as_yaml
  File "/usr/local/lib/python2.7/dist-packages/loomengine_utils/file_utils.py", line 5, in <module>
    import google.cloud.storage
  File "/usr/local/lib/python2.7/dist-packages/google/cloud/storage/__init__.py", line 38, in <module>
    from google.cloud.storage.batch import Batch
  File "/usr/local/lib/python2.7/dist-packages/google/cloud/storage/batch.py", line 30, in <module>
    from google.cloud import exceptions
  File "/usr/local/lib/python2.7/dist-packages/google/cloud/exceptions.py", line 24, in <module>
    from google.api_core import exceptions
  File "/usr/local/lib/python2.7/dist-packages/google/api_core/exceptions.py", line 44, in <module>
    @six.python_2_unicode_compatible
AttributeError: 'module' object has no attribute 'python_2_unicode_compatible