Update git submodules

* Update docs/submodules/vswitchperf from branch 'master'
  - CI: Update hugepages configuration

    Changes introduced by this patch:
    * Configure more hugepages to be used during CI run.
    * Fix detection of correct ovs-vswitchd execution.
    * Skip VPP shutdown overhead in case that VPP execution
      has failed.

    Change-Id: Id1badd61334141dcc331691af4a1401a09d06807
    Signed-off-by: Martin Klozik <martinx.klozik@intel.com>

diff --git a/docs/submodules/vswitchperf b/docs/submodules/vswitchperf
index f2cf028..39c94c3 160000 (submodule)
--- a/docs/submodules/vswitchperf
+++ b/docs/submodules/vswitchperf
@@ -1 +1 @@
-Subproject commit f2cf028bcb55b868f62fd25c692bd32dd92c27ef
+Subproject commit 39c94c3828af47d8a4c4c090ce0bac6e0566e424