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"

maybe for py2,,/r/n and /n have same meaning for split,but in py3,
They doesn't look the same, /r/n does not transform file to make
the split on the line.The most intuitive reflect is when the parameter
is a/r/n can't correct the split, and parameters for/n, py3 and py2
test can be normal...

Into a /n can improve python3 support issues.

my development system is ubuntu14.04

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/388406

[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.

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

[jian.song (jiansong)]

/r/n and /n have same meaning for split in py2 and py3,but in py3,
They doesn't look the same, /r/n does not transform file to make
the split on the line.The most intuitive reflect is when the parameter
is a/r/n can't correct the split, and parameters for/n, py3 and py2
test can be normal...

Into a /n can improve python3 support issues.

[jian.song (jiansong)]

about "a slightly higher level than CR-LF vs LF",I don't know much about it... But when I use '\ n' as an argument, all the test can pass...

[jian.song (jiansong)]

But use \ r \ n, py34 test_operating_system will have related error...

[OpenStack Infra (hudson-openstack)]

Change abandoned by amrith (<email address hidden>) on branch: master
Review: https://review.openstack.org/388406
Reason: "abandoned for inactivity, over 3 weeks old, has a negative review comment and is not currently marked as a WIP or WF-1. please restore the change if you wish to work on it."