This update for avahi fixes the following issues:

- Change python3-Twisted to a soft dependency. It is not available
  on SLED or PackageHub, and it is only needed by avahi-bookmarks
  (bsc#1196282)
- Fix warning when Twisted is not available
- Have python3-avahi require python3-dbus-python, not the
  python 2 dbus-1-python package (bsc#1195614)
- Ensure that NetworkManager or wicked have already started before 
  initializing (bsc#1194561)
- Move sftp-ssh and ssh services to the doc directory. They allow
  a host's up/down status to be easily discovered and should not
  be enabled by default (bsc#1179060)