All test runs ending in "AttributeError: 'file' object has no attribute 'buffer'"

[Julian Edwards]

100% reproducible for me.

Traceback (most recent call last):
  File "/usr/bin/maas-test", line 9, in <module>
    load_entry_point('maas-test==0.1', 'console_scripts', 'maas-test')()
  File "/usr/lib/python2.7/dist-packages/maastest/main.py", line 100, in
main
    output_stream.buffer.getvalue().encode('utf-8'))
  File "/usr/lib/python2.7/dist-packages/maastest/utils.py", line 286,
in __getattr__
    return getattr(self.stream, attr)
AttributeError: 'file' object has no attribute 'buffer'