Update git submodules

* Update docs/submodules/releng from branch 'master'
  to fefa0c052135007be837324c3665a223009a06ba
  - Clean EOF K8s releases

    https://kubernetes.io/releases/

    Change-Id: I9190c66fde68847ffe6fb5098c6b6f0e47d4c527
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e3203a0..fefa0c0 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e3203a0baedb1fba21561658507bb23c07cb4970
+Subproject commit fefa0c052135007be837324c3665a223009a06ba