fetch2/sftp: Set BatchMode=yes as argument to sftp
Set BatchMode=yes instead of PasswordAuthentication=no. This will make
sftp fail immediately, not only when SSH requires interactive
authentication, but also on errors related to host key verifcation.
Signed-off-by: Olof Johansson <olof.johansson@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>