Fix publisher list rendering

Currently if there are more than 1 element in publisher list
it will be rendered incorrectly (wrong indentation),
this patch uses yaml filter to fix this.

Change-Id: I14170e546c0dbb34fef45ed8cac7ef8e95fe4579
Related-Prod: https://mirantis.jira.com/browse/PROD-20427
4 files changed