Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - Copy the dev bind to standard path

    Change-Id: I56e3bbcc5154025e0c63cd5e4cebc368b103aee5
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 16b4c6a..22e4c2a 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 16b4c6a773018a9235aaf99ea31d6f8b53261504
+Subproject commit 22e4c2aa2e77e3db7ab5a6d6c89ad2738d1d0346