Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - hosts info config in container
    
    JIRA: DOVETAIL-435
    
    in some SUT, there's a need to config hosts <domain name>:<ip> info
    in container /etc/hosts, ortherwise, SUT service will not be used.
    
    usage:
    
    1,for dovetail directly running, cd ${DOVETAIL_HOME}/userconfig
      vim hosts.yaml
      sth like
      hosts_info:
        - domain_nameA:192.168.33.101
        - domain_nameB:<some IP>
    2,for dovetail container running, first get inside the container,
      cd /home/opnfv/dovetail/userconfig
      vim hosts.yaml
      same as 1.
    
    Change-Id: Ic5d87df3d78c0fa1d08c4e972c0fc97e61b906e9
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>
    

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