Fix an error about line_terminator

[jian.song]

In Linux /n as a newline, and Windows is /r/n, so I will be the
default value is set to "/n" for line_terminator, in fact, the most intuitive
is solved test_operating_system.TestOperatingSystem.test_key_value_file
_codec problem.

before change:http://paste.openstack.org/show/585902/

We can see from the error message：
b"reference = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}"
b"actual = {'key1': 'value1\\nkey2=value2\\nkey3=value3'}"

For this reason I think it's about time to split not the cut with a "/n"

[jian.song (jiansong)]

The company's network speed... Submit repeat every time out...

[Amrith Kumar (amrith)]

What is the purpose of this bug?

Is it that:

- your development environment is Windows?
- you wish to deploy Trove on Windows?

To be clear, I don't believe that either of these are (currently) within scope for Trove though the former is a smaller ask than the latter.

[Amrith Kumar (amrith)]

Please describe the problem you are trying to solve (at a slightly higher level than CR-LF vs LF).

[jian.song (jiansong)]

Please to this discussion... https://bugs.launchpad.net/trove/+bug/1634755