Update git submodules

Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Merge "opnfvresultdb: Add mapping for VPP TCs"
  - opnfvresultdb: Add mapping for VPP TCs

    Patch adds testcase mapping among native VSPERF VPP TCs and appropriate
    TC names defined in results DB.

    JIRA: VSPERF-488

    Change-Id: I5c4a50587a354a741c738d255105726943a701f5
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>
    Reviewed-by: Mars Toktonaliev <mars.toktonaliev@nokia.com>
    Reviewed-by: Morgan Richomme <morgan.richomme@orange.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>