Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Updating release notes for OPNFV Fraser 6.2

    Change-Id: I9a9da79cb4ccb245ddb38b50b561da51a40a359d
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 95b73fd..247bf82 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 95b73fd50f4a5bbd095c5e7291057a639e057716
+Subproject commit 247bf8232dacf0108eb46efe8cf2151bbf855b8a