NetworkInfoTest.test_get_active_device_info is locale dependent

[Данило Шеган]

Running the above test in eg. a Serbian locale fails with:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/mock/mock.py", line 1305, in patched
    return func(*args, **keywargs)
  File "/home/ubuntu/canonical/landscape-client/ifconfig-locale-dependency-fix/landscape/lib/tests/test_network.py", line 27, in test_get_active_device_info
    result = result.decode("ascii")
exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 21: ordinal not in range(128)

This is due to ifconfig having non-ASCII in the output (http://paste.ubuntu.com/24227354/). Before the py3 porting work, this test used to fail for me locally with "UP" not found assertion, so it was locale-dependent before too.