[Dovecot] Remove user queries from passdb + add a second passdb for additional algorithms + create userdb without password queries

data/conf/dovecot/dovecot.conf

@@ -43,7 +43,11 @@ passdb {
   pass = yes
 }
 passdb {
-  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-passdb.conf
+  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-ssha256-passdb.conf
+  driver = sql
+}
+passdb {
+  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-additional-passdb.conf
   driver = sql
 }
 # Set doveadm_password=your-secret-password in data/conf/dovecot/extra.conf (create if missing)
@@ -238,7 +242,7 @@ listen = *,[::]
 ssl_cert = </etc/ssl/mail/cert.pem
 ssl_key = </etc/ssl/mail/key.pem
 userdb {
-  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-passdb.conf
+  args = /usr/local/etc/dovecot/sql/dovecot-dict-sql-userdb.conf
   driver = sql
 }
 protocol imap {