DejaGNU: Set correct password

There are issues with FTP procedures when running regressions, naimly an error
'can not find channel named "exp5"' in ftp_download. It seems that they have
been happening because ftdp expects password even when it is empty, but
DejaGNU has was sending it like `user $user $pass`, so when password is an
empty string, ftpd was treating like an absense of password in command,
since there are no quaotes. To workaround this issue I set `ftp_passwrod` to
\'\', so DejaGNU will send it like `user $user ''`. That will make sure that
ftpd will treat this as an empty assword.

It looks like that this problem poped up after rebasing to the latest
buildroot release.

Signed-off-by: Anton Kolesov <[email protected]>

Author: anthony-kolesov

dejagnu/baseboards/arc-linux-aa4.exp

@@ -58,7 +58,7 @@ set_board_info telnet_exec_timeout   120
 
 # Set up FTP connection details.
 set_board_info ftp_username          root
-set_board_info ftp_password          ""
+set_board_info ftp_password          "\'\'"
 set_board_info ftp_download_timeout  10
 set_board_info ftp_upload_timeout    10