unescape literal new-line

[nicolasparada]

Unescape literal new line character.

When using a config like this:

[INTPUT]
    split_me "foo\nbar"

This was unquoted and the \n inside was treated as a new line character, so doing a strings.Split(splitMe, "\n") worked as expected []string{"foo", "bar"}.

But when using a config like this:

[INTPUT]
    split_me foo\nbar

Since it does not have quotes, it was not unquoted and the \n was not treated as a new-line character but as a literal \\n. Hence doing the same split results in []string{"foo\\nbar"}.