Update dovecot to version 2.3 / rev 10 via SR 954323
    
    https://build.opensuse.org/request/show/954323
    by user dstoecker + dimstar_suse
    - Fix changelog and permissions
    - (bsc#1185074) /var/run in /usr/lib/tmpfiles.d/dovecot.conf is
      deprecated, please use /run instead
    - Refreshed spec-file via spec-cleaner and manual optimization.
      * Removed file dovecot.init (droped SystemV support).
      * Added parameter -p to all install command in spec-file.
      * Added %{name} macro wherever possible.
    - Check first if they exist before creating user and group accounts
    - Use macro for systemd-tmpfiles call
    - Pre-Require shadow if we use it in %pre
    - Remove unused systemd requires/defines.
    - removal of SuSEfirewall2 service, since SuSEfirewall2 has been replaced by
      firewalld, see [1].
      [1]: https://lists.opensuse.org/opensuse-factory/2019-01/msg00490.html
    - Add information about the interaction with Apparmor to README.SUSE
    - bump reco