Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 051206b1219c469c86f108780740f79e74a58661
  - Conform with "Clone repositories instead of wgetting constraints"

    https://gerrit.opnfv.org/gerrit/c/functest/+/70332

    Change-Id: Ifbf01bc613afa17f3d68a581fb704e67ca93a60e
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c56a342..051206b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c56a3429e0c2a5cad3246fccb61c6a448331a71d
+Subproject commit 051206b1219c469c86f108780740f79e74a58661