Bug#680678: task-ssh-server: depend on 'ssh' instead of 'openssh-server'

[Bob Bib <bobbibmpn@mail.ru>]

reopen 680678
thanks

Hello again,

the changes in 3.11 are somewhat pointless;
as for now, 'task-ssh-server':
- depends on:
openssh-server, tasksel
- recommends:
openssh-client [and it's pointless, because 'openssh-server' already _depends_ (not recommends!) on it].

Instead of making such redundant depandencies,
in my original bug report I've just suggested for 'task-ssh-server' to depend only on 'ssh' metapackage :)