[Dovecot] Remove auth cache

data/conf/dovecot/dovecot.conf

@@ -384,9 +384,9 @@ service stats {
   }
 }
 imap_max_line_length = 2 M
-auth_cache_verify_password_with_worker = yes
-auth_cache_negative_ttl = 0
-auth_cache_ttl = 30 s
-auth_cache_size = 2 M
+#auth_cache_verify_password_with_worker = yes
+#auth_cache_negative_ttl = 0
+#auth_cache_ttl = 30 s
+#auth_cache_size = 2 M
 !include_try /usr/local/etc/dovecot/extra.conf
 default_client_limit = 10400