Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Fix latency commands in l3 submode

    Change-Id: I9c46b57f98b566efc8ca3ea5966befe2a150315b
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index f608601..e700372 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit f608601d06f2da7dcb52f0a0da6caebd12412ad1
+Subproject commit e70037210bf844e7681003f806498f0cc18eba63