Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Merge "Add API to update hosts info about SUT"
  - Add API to update hosts info about SUT
    
    JIRA: YARDSTICK-674
    
    For some SUT which use domain name as endpoint and AUTH_URL, yardstick
    restAPI should support to add "ip domain_name" info into /etc/hosts so
    that it can use the ip_address to access the SUT.
    
    api: /yardstick/env/action
    description: update hosts info for domain name
    method: POST
    
    parameters:
    {
        "action": "update_hosts",
        "args": {"opnfv.org": "1.1.1.1",
                 "openstack.org": "2.2.2.2"
                }
    }
    
    Change-Id: Iaca9c846f02b1d53e2408d6a21f9201b599717d4
    Signed-off-by: rexlee8776 <limingjiang@huawei.com>
    

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