[Savannah-hackers-public] mailing lists interface fix

[Assaf Gordon]

Hello all,

following this bug:
  reset list admin password working?
  http://savannah.gnu.org/support/?109296

I finally got a chance to dig into the mailing list interface
(and learned how it works for the first time).

Mailing list password-reset should work now.

There were two problems:
1. The cronjob mgt0:/opt/savannah/bin/sv_mailman used hard-coded path
   to scripts which did not exist.
2. The script which did exist in different path 
(mgt0:/opt/savannah/sbin/change_pw)
   was a no-op stub.

I fixed it by implementing 'change_pw' and creating symlinks from the 
hard-coded paths
to /opt/savannah/sbin (I know, the Right Thing would be to fix 'sv_mailman' and 
remove the hard-coded paths, but I didn't get to it yet).

I also documented all I learned here: 
  https://savannah.gnu.org/maintenance/MailingListsInternals/


comments welcome,
 - assaf