Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - ci: Use log scale for B2B graphs

    Graph configuration for B2B was modified to show correct y axis
    tittle and to use log scale.

    Change-Id: I7ac75ca803f93be28d89a4504e046b1119d341e1
    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 05bb3ac..d3b124a 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit 05bb3ac689e081218c8f885a8f720e006fdb1634
+Subproject commit d3b124a22bf3aa2c05a5cb030f37b97db3d27dbd