Merge pull request #187 in ASAPO/asapo from feature_ASAPO-152-kafka-notifications to develop

* commit '7f88d281':
  some refactoring
  Send kafka notifications only for online files
  fix kafka unit test
  Remove windows test for kafka, update kafka message for full path
  final (hopefully) fix to kafka integration test
  another fix to kafka integration test
  correctly pass the nomad var to integration test
  fix warnings in kafka_mock
  kafka integration test
  docker image script update
  update hints and cmake message
  copy dll files to receiver output folder
  use FindRdKafka
  Better kafka cmake deps
  And another receiver konfig fix
  Add kafka config to deploy configuration
  Fix unit tests
  Add unittests for kafka notifications
  Add rdkafka client