Checkmk Werk 8840: Docker: Introduce host labels for different docker hosts

ID: 8840 Title: Docker: Introduce host labels for different docker hosts Component: Core & setup Level: 1 Class: New feature Version: 1.6.0b5 Docker nodes will now automatically marked with the discovered label "cmk_docker_object:node". The docker container host objects will be marked with the host label "cmk_docker_object:container".