add OpenFAAS support

[Thomas Bailet]

- controllerService: faas_service
  component: com.hurence.logisland.service.faas
  configuration:
    faas.server: http://myfaas.org    


   # add field if defect found
    - processor: defect_tagger
      component: com.hurence.logisland.processor.FAASExecute
      configuration:
        fass.service: faas_service
        fass.function: com.hurence.iot.functions.HasDefect
        fass.param.field: record_value
        fass.response.field: has_defect
        strategy: ....