Update git submodules

Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "vpp: Reporting update related to VPP"
  - vpp: Reporting update related to VPP

    VSPERF reports were updated to contain vSwitch name.
    In case of VPP, it is not possible to read its version
    if VPP is not running. Thus VSPERF was enhanced
    to support tool version check during its runtime. This
    mechanism can be enhanced to support e.g. VNF in the future.

    JIRA: VSPERF-496

    Change-Id: I74b47505e35340eead165d9b588e9cc15c058bbf
    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>