Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - VNFs: Correcting default traffic_type to IPv4

    JIRA: SAMPLEVNF-54

    The default traffic_type value needs to be set to IPv4 instead of
    MIX type which is not supported.

    Change-Id: Ibe8ec31bc7a435fd97aaae0e9e664d0eb70ee30c
    Signed-off-by: Anand B Jyoti <anand.b.jyoti@intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index b524f64..adcb79d 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit b524f643258e8e2ae6d86482751e9f91a84b7318
+Subproject commit adcb79da90176b27224eeb1d00aa0e611ef85a9b