Update git submodules

* Update docs/submodules/samplevnf from branch 'master'
  - Add Gambia release notes

    Change-Id: Ide712ee94254b506a0ad88c95a7e01b789f99d49
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/samplevnf b/docs/submodules/samplevnf
index 9e5b1c0..982b7ab 160000 (submodule)
--- a/docs/submodules/samplevnf
+++ b/docs/submodules/samplevnf
@@ -1 +1 @@
-Subproject commit 9e5b1c09840e5536ad74b4143e31cbd04d7e966c
+Subproject commit 982b7abba88d0a72219da7220109a05fdcee2902