puppet-tripleo releasenotes job is failing

[Alex Schultz]

We're getting the following as a consistent failure.

2017-06-01 14:48:35.030848 | Warning, treated as error:
2017-06-01 14:48:35.030912 | The features section of releasenotes/notes/calculate-dhcp-agents-per-network-3089c5e7b15f8b7b.yaml does not parse as a list of strings. Is the YAML input escaped properly?
2017-06-01 14:48:35.068234 | ERROR: InvocationError: '/home/jenkins/workspace/gate-puppet-tripleo-releasenotes/.tox/releasenotes/bin/sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html'
2017-06-01 14:48:35.068336 | releasenotes finish: runtests after 4.89 seconds

http://logs.openstack.org/25/314225/16/gate/gate-puppet-tripleo-releasenotes/a8d09f9/console.html#_2017-06-01_14_48_35_030848

I've reached out to the reno team to help understand why because the yaml is valid as far as I can tell.

[Alex Schultz (alex-schultz)]

https://review.openstack.org/#/c/469945/
https://review.openstack.org/#/c/469944/
https://review.openstack.org/#/c/469943/