add `test-kitchen` 1.0 support

The 1.0 branch of test-kitchen is based on Fletcher Nichol's excellent
Jamie CI codebase.
create a `JenkinsHelper` library

Initially this module will be expose two helper methods:
`service_listening?` and `endpoint_responding?` which will be used to
determine if Jenkins operational and the API is responding.
wire in service :restart notifies

Updates to the following resources should trigger a service restart:

* WAR file (core code)
* New or updated plugins
setting version to 0.8.0

The previous (non-released) bump to `0.9.9` was premature. Some inflight
LWRP experiments may make the `1.0.0` a radical departure from the 
existing versions.