Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - Merge "Adding app version display" into stable/euphrates
  - Adding app version display

    Change-Id: Ie96af26119cef7e8340fff958253c259b46675f4
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 0fd0137..472b1d3 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 0fd0137c6059c2e84b8e06597f68e65e62bfca70
+Subproject commit 472b1d330a6b9fe8ff69bb64dd86b788112b888d