Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add scenario parameter for functest-k8s in container4nfv Proj"
  - Add scenario parameter for functest-k8s in container4nfv Proj

    Add a scenario parameter for functest-k8s in container4nfv
    project.

    Change-Id: I1465ed268c7f5015616076cd8efc923fd833c623
    Signed-off-by: Jingzhao Ni <jingzhao.ni@arm.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2d6b1f1..49f6d35 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2d6b1f1f71596a239af33b2d474eaff80fb8ffd5
+Subproject commit 49f6d3509d810fed4cbc15e1b0b86cf1eb8b266e