Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Added index files for user and dev doc dirs

    Change-Id: I0ac84324be97de91c8d4730cd3cb73e994cf28a7
    Signed-off-by: Trevor Cooper <trevor.cooper@intel.com>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index bc150a3..32079bb 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit bc150a3ea5ac7729747e16bb093c37101e2b803c
+Subproject commit 32079bbabbe102eb7dd5c5c3d3b06ffb6febd6e5