Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Fix a nit in functest-virtual.yaml"
  - Fix a nit in functest-virtual.yaml

    Change-Id: I993bac8545d896d1ead25c5f33c9645c52c5d208
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3970f5f..a13a71e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3970f5ffe03148df980f6e1518dcb105799a53d7
+Subproject commit a13a71e40f40d2bf75ab6faad240cfdf3d3a57c9