Introduce Puppet-lint/syntax test into Packstack

- Add puppet-lint and puppet-syntax
- To run puppet-lint, please look at the README.md file.

Change-Id: I4b9e5d0c030b891545bc07f10091d748cdc1482e
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>
(cherry picked from commit b2c341d4a52c46181b7ed506ce05c5b4eabcd89b)