Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Support additional MAC format in config file

    Add support for space-divided bytes in MAC string.
    Support the same format as in "pkt inline".

    Change-Id: I7f2136c4424c45ce4abad4082470c9c9b1b3ab05
    Signed-off-by: Igor Shaula <igor.shaula@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 2ba9216..b380827 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 2ba92161c4492779d0b858db468619737896dd9f
+Subproject commit b38082760fc411a8fc9e74f9c2d3a44ad633db5c