[For Review] Add Elasticsearch 5.3.3

[amanaplan]

Submitted for use and review in order to facilitate the ability for developers to begin building and evaluating Elasticsearch as a viable service and solution for some of our downstream projects.

• Adds Elasticsearch 5.3.3 (mirrors latest release on AWS) as a new service in Precip
• Removes the defunct Modulefile (deprecated in Puppet 3.x, removed in 4.x) from the precip Puppet module
• Adds metadata.json to the precip Puppet module

[jeffgeorge]

See inline changes, I'm fine adding ES, I just want to make sure we do it modularly.

[jeffgeorge]

Two stylistic items here:

1. Two Spaces instead of tabs, please: http://puppet-lint.com/checks/hard_tabs/
2. Line up arrows under the config element: http://puppet-lint.com/checks/arrow_alignment/

[jeffgeorge]

Additionally, rather than just adding Elasticsearch by default, I'd like to see it wrapped in a feature-switch. So, new object in config.rb, Vagrantfile and a new Fact, tracking enabled optional things. We can then use the same kind of functionality to optionally provision Solr, or optionally provision PML, or optionally provision in-box theme compilation tools.

I'd also like to see any optional things pulled into their own class in their own Puppet file.