Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - Removed white space

    Change-Id: I4455ce38ca81ad1d5a028c626e3ac53d6d87db43
    Signed-off-by: Trevor Cooper <trevor.cooper@intel.com>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index bbf2923..46bf1f2 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit bbf29235eda28018ecf949c4a228f04de56c4745
+Subproject commit 46bf1f20870e4942538a616cc639aa6cfd952145