Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "Fix using signature in latency measurements"
  - Fix using signature in latency measurements

    When doing latency measurements the generator can add a
    32 bits signature in the packet at a specific location,
    so that the receiver only uses the packets generated by the
    generator and ignores packets generated for instance by a switch
    The is particuly important for latency measurements as we use
    data in the packets as timestamps, and packets generated elsewhere
    would result in random latency for those packets.

    Change-Id: I8352b35aff76ec8d1344a1e492b9dcc20a53f1ce
    Signed-off-by: Xavier Simonart <xavier.simonart@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 283d14e..bc200c7 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 283d14ec835b500d23433354680521779cb2935f
+Subproject commit bc200c70803eaf5e9357f217e800e58ca6163f48