Merge pull request #154 in ASAPO/asapo from feature_ASAPO-137-create-meta-per-stream to develop

* commit '85e2141b':
  add python functions, add tests
  refactor producer -blocking request
  return  tests
  implement update operation
  fix tests
  refactor mets scheme
  fix tests, refactor
  add replace/ingest meta modes, fix tests
  add python api, tests
  fix tests
  fix tests
  fix build and test
  fix build
  update receiver
  update producer