engine: change formatter "addNewLine" to "insert"

Change the code formatter configuration to have "addNewLine"
set to "insert" instead of "do not insert" to align it with the
checkstyle validations that fails if there's no new line in the end of
file.

Change-Id: I495e11e20c315e267e9f8141f7fecf45e39a3363
Signed-off-by: Alissa Bonas <abonas@redhat.com>