Handle list of lines instead of strings in file.line func
Handle list of lines instead of strings in file.line func

In `Fluorine`, in order to better handle line endings, the "body" variable
has been changed to a list of strings. Therefore, we need to handle encoding
or decoding the elements in the list, rather than using the `stringutils`
functions.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt