Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[samplevnf] Add stable/gambia branch"
  - [samplevnf] Add stable/gambia branch

    Change-Id: I3f3b0b150defb12553740f0d4c3ec111fceb7a5b
    Signed-off-by: Deepak S <deepak.s@linux.intel.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2b90093..358ddec 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2b9009385839d6dc33beabd4eb833b179d4693f4
+Subproject commit 358ddec610610851c5fa67024a80f6788f2724d5