Do not decode the log content into a string only to re-encode it as
binary data again. Some logs might un-intentionally contain bytes that
do not decode as utf-8, as such preserve the log file content as it was
on disk.
Handle the decoding on the resulttool side, but also handle the failure
to decode the data.
Signed-off-by: Nathan Rossi <nathan@nathanrossi.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>