Update git submodules

* Update docs/submodules/yardstick from branch 'master'
  - Integrate vsperf in Tgen mode
    
    Problem:
    Running Vsperf in Tgen mode is supported but the integration is not complete at the code level
    i.e. not ready-to-use, and dpdk loopback is not supported inside the VM.
    
    Solution:
    (1) Completely automates VM image generation and supports 1G huge pages.
    (2) Adds a new test scenario VsperfDPDK for testpmd based loopback inside the VM.
    
    Update 1-2: Fixed "line too long" issues not reported by local run_tests.sh (why?)
    Update 3: Per comment change to use SSH.from_node() and add unit test cases
    Update 4: Add more unit test cases for coverage and ready the code for merge
    
    JIRA: YARDSTICK-661
    
    Change-Id: Iea3014d4c83e1b0c079019a4ed27771d40a7eed8
    Signed-off-by: Jing Zhang <jing.c.zhang@nokia.com>
    

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