Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - ci: Configure graphical output

    Modify configuration of graphs generated from CI results.

    Change-Id: Id1a30e0c61419ff131fb4f41138af2e62f822b9c
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index 5fe9089..a96c5e8 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit 5fe9089057bf23fd7ff312779d928cc9932fd38b
+Subproject commit a96c5e8bc383302ff700e1f757a6626e529db44c