Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "loadgen: Support for Stressor-VMs as a Loadgen"
  - loadgen: Support for Stressor-VMs as a Loadgen
    
    This patch adds support for stressor-VMs as a loadgen in VSPERF.
    The changes include:
    1. 07_loadgen.conf: User can specify the stressor-VM specific
    configuration. It includes, image-name, path, nics, memory, etc.
    2. loadgen/stressorvm/stressor_vm.py: This file implement ILoadGenerator
    interface. It implements all the necessary APIs for starting and
    stopping the loads.
    3. Fixed Pylint Error
    4. Removed the network device configuration from qemu-system-x86_64
    command as stessor-vm mostly focus on CPU and memory stressing.
    5. Moved the creation of loadgen after the VNFs are setup in
    testcase.py.
    6. Fixed copyright issues.
    7. Removed python-3 checking. Improved exception handling
    8. Set Default loadgen as DummyLoadGen
    9. Improved OSError Printing with directory name and error
    10. Update the year in license. 2017-2018.
    
    JIRA: VSPERF-504
    
    Change-Id: Iad6c0780c184f8e36eddcbcae2a580f41118e8dc
    Signed-off-by: Sridhar K. N. Rao <sridhar.rao@spirent.com>
    

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