Support deployment in Swarm cluster with macvlan network

[UniverseM5]

Following up disscussions in #95 and https://github.com/portainer/portainer/issues/3279 re-openning this issue. @deviantony

Since 1.5 realease portainer-agent won't run.

Here is my configurations: Portainer:

  Portainer:
    image:          portainer/portainer
    container_name: Portainer
    hostname: Portainer
    domainname: mydomain
    restart:        always
    mac_address:  xx:xx:xx:xx:xx:xx
    networks:
      mynet:
        ipv4_address: 192.168.1.104
    deploy:
      mode: global
      placement:
        constraints:
          - node.role == manager
          - node.hostname == server
    command: --no-auth --admin-password=''
    volumes:
      - /Dockers/Portainer:/data
      - /etc/localtime:/etc/localtime:ro
    environment:
      - CAP_HOST_MANAGEMENT=true

Portainer-Agent:

  Portainer-Agent-FRW:
    image:          "portainer/agent:dev"
    container_name: Portainer-Agent-FRW
    hostname: Portainer-Agent-FRW
    domainname: mydomain
    restart:        always
    mac_address: xx:xx:xx:xx:xx:xx
    networks:
      mynet:
        ipv4_address: 192.168.1.134
    deploy:
      mode: global
      placement:
        constraints:
          - node.hostname == server
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
      - /var/lib/docker/volumes:/var/lib/docker/volumes
    environment:
      - AGENT_CLUSTER_ADDR=192.168.1.134
      - CAP_HOST_MANAGEMENT=true
      - LOG_LEVEL=debug

Network:

networks:
  mynet:
    name: mynet
    driver: macvlan
    driver_opts:
      parent: ens18
    ipam:
      config:
        - subnet: 192.168.1.0/24

Error:

│   2019/10/23 07:31:58 [DEBUG] [docker] [network_name: mynet] [scope: local] [ingress: false] [message: Skipping invalid container network]           │
│   2019/10/23 07:31:58 [ERROR] [main,docker] [message: Unable to retrieve local agent IP address] [error: unable to retrieve the address on which   │
│    the agent can advertise. Check your network settings]                                                                                           │
│   2019/10/23 07:32:00 [DEBUG] [main,configuration] [Member tags: map[AgentPort:9001 EngineStatus:swarm NodeName:ubuntu NodeRole:manager]]          │
│   2019/10/23 07:32:00 [INFO] [main] [message: Agent running on a Swarm cluster node. Running in cluster mode]