Add Test-Kitchen Support

Change-Id: Id4dad06d14c686a17d24d2de8f40ca9f75916189
Don't hardcode the HPCS CA, and ensure LogStash is restarted when the cert/key is changed

new pillar: [secrets:]logstash:ssl_cacert

Change-Id: Ibba73c23c3a0a26556212593f7d3d20aea539c5e
Upgrade to kitchen-salt 0.0.7

Change-Id: I329bee0861fefa569772bc626a1fb39ea7b085c1