Update git submodules

Update git submodules

* Update docs/submodules/compass4nfv from branch 'stable/danube'
  - Update moon role for moonv4

    JIRA: -

    To deploy moon(master/slave) scenario configure moon role in DHA file like:

      - name: host4
        roles:
          - moon

    To deploy moon master, export MOON_CFG env like below compass deploy:
    export MOON_CFG="master:flag=Disable,slave:flag=Enable,slave:name=slave1,slave:master_ip=master_ip"

    To deploy moon slave, export MOON_CFG env like below compass deploy:
    export MOON_CFG="master:flag=Enable,slave:flag=Disable,slave:name=slave1,slave:master_ip=master_ip"

    Change-Id: Ie300a85979af31634ab0660ccee1ee8b094110b5
    Signed-off-by: QiLiang <liangqi1@huawei.com>