puppet: change JJB syntax for nodes
Don't expose the nodes as a list when it's one node.
puppet_version:
- 3
- 4
- node:
- - centos-7
+ node: centos-7
jobs:
- 'gate-{name}-puppet-lint'
- 'gate-{name}-puppet-syntax'
- job-group:
name: 'puppet-openstack-libraries-jobs'
- node:
- - centos-7
+ node: centos-7
puppet_version:
- 3
- 4
