Allow single line log entries after multilines

[tom-dudley]

Fixes #2473

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Testing

Prior to this change I would get the following output when trying to capture some multiline entries in a log file which also had single line entries afterwards:

{"name"=>"John", "age"=>"50
Some other log entry
Yet another log entry"}

With this change I now correctly get:

{"name"=>"John", "age"=>"50"}
{"log"=>"Some other log entry"}
{"log"=>"Yet another log entry"}

Documentation

• Documentation required for this feature

I can add a bit to the docs if it'll make thing clearer.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

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