Update git submodules

* Update docs/submodules/samplevnf from branch 'stable/euphrates'
  - common: arp_route_tbl entry is not working

    JIRA: SAMPLEVNF-80

    The arp_route_tbl entry was not getting effected as the vnf_gateway
    flag was not set after adding entry to routing table.

    This patch fixes the issue.

    Change-Id: Id3b1b14b698dea5e2beea7f3e90e8622896b5c5f
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index ff7ced9..5cbb706 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit ff7ced9ffeb217d692550b47e23ccc8822de7bcf
+Subproject commit 5cbb7066aef466bad9a806ce04393ad739047447