CA-44731: Rewrite file_lines_iter in terms of file_lines_fold.
CA-44731: Rewrite file_lines_iter in terms of file_lines_fold.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@eu.citrix.com>

djs55/forkexecd,xapi-project/message-switch,xapi-project/message-switch,xapi-project/message-switch,johnelse/forkexecd