Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - trex: Add support for traffic capture
    
    A support of traffic capture was added into T-Rex.
    It allows to write a functional tests, which will
    verify proper vSwitch functionality by inspection
    of packets received by T-Rex.
    A testcase example was added into integration
    testcases.
    
    JIRA: VSPERF-556
    
    Change-Id: I5ad28479ca2ec29760b68f24510af1a6d74866ae
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
    Reviewed-by: Al Morton <acmorton@att.com>
    Reviewed-by: Christian Trautman <ctrautma@redhat.com>
    Reviewed-by: Sridhar Rao <sridhar.rao@spirent.com>
    Reviewed-by: Trevor Cooper <trevor.cooper@intel.com>
    Reviewed-by: Richard Elias <richardx.elias@intel.com>
    

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