Merge commit 'refs/changes/07/66607/5' of https://review.openstack.org/stackforge/fuel-main into broken66607

It was reverted in master cuz of the iso build error
(http://jenkins-product.srt.mirantis.net:8080/job/fuel_4_1_iso/57/console):
touch /home/jenkins/workspace/tmp/fuel_4_1_iso/build/packages/rpm/rpm-nailgun-agent.done
cp -f /home/jenkins/workspace/tmp/fuel_4_1_iso/build/repos/nailgun/bin/fencing-agent.rb
/home/jenkins/workspace/tmp/fuel_4_1_iso/build/repos/nailgun/bin/fencing-agent.cron
/home/jenkins/workspace/tmp/fuel_4_1_iso/build/packages/rpm/SOURCES
cp: не удалось выполнить stat для «/home/jenkins/workspace/tmp/fuel_4_1_iso/
build/repos/nailgun/bin/fencing-agent.rb»: Нет такого файла или каталога
cp: не удалось выполнить stat для «/home/jenkins/workspace/tmp/fuel_4_1_iso/
build/repos/nailgun/bin/fencing-agent.cron»: Нет такого файла или каталога
make: *** [/home/jenkins/workspace/tmp/fuel_4_1_iso/build/packages/rpm/
rpm-fencing-agent.done] Ошибка 1

Change-Id: I49d239bdcdd22c2b47bd77eb3bd8718318b0ac88