Bug 179432

The upstream dovecot-example.conf is essentially:

     ---
     $> grep -v '^ *\(#\|$\)' dovecot-example.conf
     protocol imap {
     }
     protocol pop3 {
     }
     auth default {
       mechanisms = plain
       passdb pam {
       }
       userdb passwd {
       }
       user = root
     }
     ---

And, because of the builtin defaults, that's essentially the same as:

     ---
     auth default {
       passdb pam {
       }
       userdb passwd {
       }
     }
     ---

What's nice about this is that people can start with the above simple config
file and make the few changes they need for their system.

However, Fedora's dovecot-example.conf is:

     ---
     $> grep -v '^ *#' /etc/dovecot.conf | grep -v ^$
     protocols = imap imaps pop3 pop3s
     listen = [::]
     ssl_listen = [::]
     ssl_cert_file = /etc/pki/dovecot/certs/dovecot.pem
     ssl_key_file = /etc/pki/dovecot/private/dovecot.pem
     mbox_read_locks = fcntl
     mbox_write_locks = fcntl
     protocol imap {
     }
     protocol pop3 {
     }
     auth default {
       mechanisms = plain
       passdb pam {
       }
       userdb passwd {
       }
       user = root
     }
     ---

It would be much nicer IMHO if we made these changes in the builtin defaults
rather than in the example configuration.

Attaching an untested patch to do this. Note:

  - No need to change default ssl_key_file and ssl_cert_file paths - you're 
    building with the correct --with-ssldir
  - No need to change "ssl_listen" as well as "listen" - "ssl_listen" defaults 
    to the value of "listen" if it's unset
  - No need to change "mbox_read_locks" - the upstream default is the same