Code review comment for ~xnox/snappy-device-agents:compress-file-qcow2

The merge was fine but running tests failed.

Already using interpreter /usr/bin/python3
Using base prefix '/usr'
New python executable in /tmp/tmp168yxu/env/bin/python3
Also creating executable in /tmp/tmp168yxu/env/bin/python
Installing setuptools, pkg_resources, pip, wheel...done.
Collecting flake8==2.4.0
  Using cached flake8-2.4.0-py2.py3-none-any.whl (28 kB)
Collecting mccabe<0.4,>=0.2.1
  Using cached mccabe-0.3.1-py2.py3-none-any.whl (7.6 kB)
Collecting pep8<1.6,>=1.5.7
  Using cached pep8-1.5.7-py2.py3-none-any.whl (37 kB)
Collecting pyflakes<0.9,>=0.8.1
  Using cached pyflakes-0.8.1-py2.py3-none-any.whl (35 kB)
Installing collected packages: pyflakes, pep8, mccabe, flake8
Successfully installed flake8-2.4.0 mccabe-0.3.1 pep8-1.5.7 pyflakes-0.8.1
running flake8
snappy_device_agents/__init__.py:282:13: F841 local variable '_' is assigned to but never used