Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Fix latest tag in functest-virtual.yaml

    Change-Id: If3df5a002db5157dea423f3acac6c47b78d9b4ad
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e102238..2709b8a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e10223883ecb66b9233d0f45ebbb9d5f57eba78a
+Subproject commit 2709b8acc38cd1b1f6f847300f80730636223907