Update git submodules

* Update docs/submodules/releng from branch 'master'
  to f2b5e9b5f666774931b6bbcf47badcde274e6933
  - Force Global Functest kubernetes lock

    All testing runs on the same server: lf-virtual1.

    Change-Id: I32d76a80b8ab134222f743d779d1e713daa69f93
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 20a10fd..f2b5e9b 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 20a10fda0c2442d3764ce4bacff33ba23f53d0c2
+Subproject commit f2b5e9b5f666774931b6bbcf47badcde274e6933