* Add getter for pipeline protocol
* Refactoring: extract bare string into constant
* Report pipeline protocol to Monitoring as part of logstash_state docs
* Report all protocols, not just first one
* Refactoring: rename constant to be more descriptive
* De-dupe protocols list before sending to monitoring
* Checking for single protocol
* Adding missing require
This was being masked and was uncovered when this test suite was run by itself
* Raising error if multiple protocols are specified
* Adding back comma
