A dependency "Requires(post): initscripts" was introduced to solve issue in bug #182462. Now since we're slowly switching to systemd this is no longer necessary, and this pollutes rootfs with outdates shell-scripts. So we should remove it.
avahi-0.6.31-30.fc21 has been submitted as an update for Fedora 21. https://admin.fedoraproject.org/updates/avahi-0.6.31-30.fc21
Package avahi-0.6.31-30.fc21: * should fix your issue, * was pushed to the Fedora 21 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing avahi-0.6.31-30.fc21' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/FEDORA-2014-15857/avahi-0.6.31-30.fc21 then log in and leave karma (feedback).
avahi-0.6.31-30.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.