Add random created master at each startup to handle SOGo features

data/conf/dovecot/dovecot.conf

@@ -18,6 +18,12 @@ ssl_cipher_list = EDH+CAMELLIA:EDH+aRSA:EECDH+aRSA+AESGCM:EECDH+aRSA+SHA384:EECD
 ssl_dh_parameters_length = 2048
 log_timestamp = "%Y-%m-%d %H:%M:%S "
 recipient_delimiter = +
+passdb {
+  driver = passwd-file
+  args = /etc/dovecot/dovecot-master.passwd
+  master = yes
+  pass = yes
+}
 passdb {
   args = /etc/dovecot/sql/dovecot-mysql.conf
   driver = sql

data/conf/sogo/sieve.creds

@@ -0,0 +1 @@
+EEFos0swXBmY5rfy:7xKWGpXVC4w5vGNnJNa09o9X