As a Policy Platform Developer, I would to create the Dmaap messaging flow in the PAP Engine code so that PDPs can  Register/UnRegister with the PAP for policy deployment.

This story covers the following subsections of the API wiki - https://wiki.onap.org/display/DW/Policy+Design+and+API+Flow+for+Model+Driven+Control+Loop+-+Draft

• 4.1.1 PAP API for PDPs – Handle Registration/De-registration of PDP. Also listen to DMAAP topic for PDP_STATUS message coming from PDP and update the DB to provide health, and statistical information.

Acceptance Criteria:

• Cucumber tests defined
• Code implementation in policy/pap 
• Logging v1.2 requirements
• No sonar/checkstyle issues introduced
• HTTPS configurable (if applicable)
• AAF/CADI support (if applicable)
• CSIT test exists for this repo that tests each Dmaap API
• Work with S3P developer so they can develop the performance/stability tests.
• Documentation