ES Archiver Test Fixtures Fail To Parse on Windows

[cuff-links]

Environment:
Windows 7
Kibana: Master
node: 8.11.3
Chrome: 65
FF: 59

This happens both in functional_test_runner and wdio tests. When trying to use ES Archiver on Windows, there is a parsing problem for the mappings files. This only happens on Windows.

Stacktrace:

 debg  Loading config file from "C:\\Users\\John Dorlus\\Desktop\\kibana\\test\\wdio_functional\\config.js"
 info  [logstash_functional] Unloading indices from "mappings.json"
ERROR  Data load failed.
ERROR  SyntaxError: Unexpected token { in JSON at position 9016
           at JSON.parse (<anonymous>)
           at Transform.transform [as _transform] (C:/Users/John Dorlus/Desktop/kibana/src/utils/streams/json_streams.js
:42:23)
           at Transform._read (_stream_transform.js:186:10)
           at Transform._write (_stream_transform.js:174:12)
           at doWrite (_stream_writable.js:397:12)
           at writeOrBuffer (_stream_writable.js:383:5)
           at Transform.Writable.write (_stream_writable.js:290:11)
           at Transform.ondata (_stream_readable.js:639:20)
           at emitOne (events.js:116:13)
           at Transform.emit (events.js:211:7)
           at addChunk (_stream_readable.js:263:12)
           at readableAddChunk (_stream_readable.js:250:11)
           at Transform.Readable.push (_stream_readable.js:208:10)
           at Transform.push (_stream_transform.js:147:32)
           at Transform.flush [as _flush] (C:/Users/John Dorlus/Desktop/kibana/src/utils/streams/split_stream.js:66:14)

[spalger]

I assume this is being caused by the local git repo converting line endings from \n to \r\n or something like that. Either way, the es archiver should not fall over if \r\n line endings are being used. Will try to get a fix up really quick.