Upgrade to 2.2.9 breaks sasl auth

[Paul]

Hi
This is my 1st time here so please be gentle.

I have encountered one problem since upgrading from 2.0.19 to 2.2.9 
which has me beat.
The system provides sasl auth services via inet to a postfix 2.11 system.
Since the upgrade postfix complains of no sasl methods available.
The same dovecot configuration is used on both versions.
Now I get these results looking at the inet connection

Version 2.0.19
root at larch:~# telnet 192.168.3.15 12345
Trying 192.168.3.15...
Connected to 192.168.3.15.
Escape character is '^]'.
VERSION 1 1
MECH PLAIN plaintext
MECH LOGIN plaintext
MECH CRAM-MD5 dictionary active
SPID 23223
CUID 1
COOKIE d0b71942d48585303f9ae4681baabf87
DONE

Version 2.2.9
root at larch:~# telnet 192.168.3.112 12345
Trying 192.168.3.112...
Connected to 192.168.3.112.
Escape character is '^]'.
VERSION 1 1
SPID 5300

Seems be something lacking in the response from 2.2.9 that fits the "no 
sasl methods" response from postfix

I believe I should supply
root at larchvm:/etc/dovecot-sasl# dovecot -n -c dovecot.conf
# 2.2.9: dovecot.conf
# OS: Linux 3.13.0-88-generic i686 Ubuntu 14.04.4 LTS
auth_mechanisms = plain login cram-md5
auth_verbose_passwords = plain
base_dir = /var/run/dovecot-sasl/
disable_plaintext_auth = no
instance_name = sasl
mail_chroot = /chroot/mail
mail_location = maildir:~/Maildir
mail_plugins = quota
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacati
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copy includ
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namespace {
   inbox = yes
   location =
   prefix = INBOX.
   type = private
}
passdb {
   args = /etc/dovecot-sasl/dovecot-sqlmd5.conf
   driver = sql
}
plugin {
   deleted_to_trash_folder = Trash
   quota = maildir:User quota quota:noenforcing
   quota_rule = Trash:ignore
   sieve = ~/.dovecot.sieve
   sieve_dir = ~/sieve
}
service auth {
   inet_listener auth-userdb {
     address = 192.168.3.112
     port = 12345
     ssl = yes
   }
   unix_listener /var/spool/postfix/private/auth {
     mode = 0666
   }
   unix_listener auth-userdb {
     mode = 0600
   }
}
service imap-login {
   inet_listener imap {
     address = 213.210.16.65
     port = 143
   }
   inet_listener imaps {
     address = 213.210.16.65
     port = 993
     ssl = yes
   }
}
service managesieve-login {
   inet_listener sieve {
     address = 213.210.16.65
     port = 4190
   }
}
ssl_cert = </etc/ssl/certs/pe.pem
ssl_key = </etc/ssl/private/pe.pem
userdb {
   args = /etc/dovecot-sasl/dovecot-sql.conf
   driver = sql
}
protocol imap {
   mail_plugins = quota imap_quota deleted_to_trash
}

Any help or suggestion warmly welcomed