[Integration] Issue during PNF service instantiation when /events/unauthenticated.PNF_READY doesn't exists

Like in topic.

If service for PNF will be created before topic /events/unauthenticated.PNF_READY will be created in dmaap then service will not be able to read from it when topic will appear.

• work flow starts without any error
• service is instantiated
• aai entry for PNF is created
• work-flow starts to wait for corresponding message on topic /events/unauthenticated.PNF_READY
• even message will appear on topic, SO will not read it and will work-flow will not be finish

In SO is missing mechanism that take care about re-subscription to /events/unauthenticated.PNF_READY topic when it appears.

 Workaround:

• Before starting any PNF service verify if unauthenticated.PNF_READY  topic exists using command

  curl --header "Content-type: application/json" --request GET http://<kubernetes slave IP>:30227/topics/listall
  

• if it doesn't exists send following curl in order to create topic

  curl
   --header "Content-type: application/json" --request POST --data '[{"correlationId": "test"}]' http://<kubernetes slave IP>:30227/events/unauthenticated.PNF_READY
  

• once again verify if it exists.
• If service will be started before topic creation there is need to restart SO-BPMN docker container