test/t-11-dovecot: Disable authentication penalty

Dovecot applies an authentication penalty, where it delays failed attempts.

Because we intentionally do bad authentications for testing, this slows
downs the tests significantly. So this patch disables it.

test/t-11-dovecot/config/dovecot.conf.in

@@ -13,6 +13,10 @@ default_login_user = $USER
 # We drop the domain, to exercise "naked" auth handling.
 auth_username_format = "%n-x"
 
+# Disable authentication penalty, since we intentionally make failed requests
+# and it just slows down tests.
+auth_failure_delay = 0
+
 passdb {
 	driver = passwd-file
 	args = $ROOT/passwd