dovecot: bump version to 2.2.29.1 (security)

Security fix:

  passdb/userdb dict: Don't double-expand %variables in keys. If dict
  was used as the authentication passdb, using specially crafted
  %variables in the username could be used to cause DoS (CVE-2017-2669)

Full ChangeLog 2.2.29 (including CVE fix):
  https://www.dovecot.org/list/dovecot-news/2017-April/000341.html

Full ChangeLog 2.2.29.1 (some fixes forgotten in the 2.2.29 release):

  https://www.dovecot.org/list/dovecot-news/2017-April/000344.html

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/dovecot/dovecot.hash

@@ -1,2 +1,2 @@
 # Locally computed after checking signature
-sha256 e0288f59e326ab87cb3881fdabadafe542f4dc7ab9996db13863a439ebbc1f25  dovecot-2.2.28.tar.gz
+sha256 ccfa9ffb7eb91e9e87c21c108324b911250c9ffa838bffb64b1caafadcb0f388  dovecot-2.2.29.1.tar.gz

package/dovecot/dovecot.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 DOVECOT_VERSION_MAJOR = 2.2
-DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).28
+DOVECOT_VERSION = $(DOVECOT_VERSION_MAJOR).29.1
 DOVECOT_SITE = http://www.dovecot.org/releases/$(DOVECOT_VERSION_MAJOR)
 DOVECOT_INSTALL_STAGING = YES
 DOVECOT_LICENSE = LGPL-2.1