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>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index 7250337..b757c8b 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit 725033715118bc318fdd6aa3745c2c07ca714086
+Subproject commit b757c8ba94b9d8664808a39d7517a11651cc0188