fix 'Invalid parameter number' error, thx to an anonymous report

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
bugfix squeeze dovecot.conf and correct wheezy dovecot-15-lda.conf, fixes #1334

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
set version to 0.9.31.2 for bugfix release

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>
Merge remote-tracking branch 'origin/0.9.31.2'