Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - tools: Update versions of tools

    Default versions of DPDK, OVS, VPP and QEMU have been
    updated.
    VPP socket file configuration is mandatory for VPP 17.10.

    Change-Id: I3465161ae9ba9b50dfd90bb19d84f128c72d44ea
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index aa533b8..caabba9 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit aa533b8a33eb0888b1f09ae8e773cfbeb1d3dda1
+Subproject commit caabba96ca0efb5e0d21ce5122da4e5fc873f4fe