Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Merge "tools: Support multiple version of DPDK build"
  - tools: Support multiple version of DPDK build

    JIRA: SAMPLEVNF-22

    This patch support building the samplevnf with multiple different
    versions of DPDK like 16.04, 16.11, 17.02 and 17.05.

    Change-Id: Ic1a10442a03311010213c5054c8d459dd41c20cf
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index d1c3754..82416b3 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit d1c37540011d2ec38dc2bd620aef897f57f5b559
+Subproject commit 82416b375a275837689cddfd1782d82996fecaca