Update git submodules

* Update docs/submodules/releng from branch 'master'
  to f24c4bedc3ea749bc90837f33707486b0e79c65d
  - Merge "Clean workspace with sudo"
  - Clean workspace with sudo

    https://build.opnfv.org/ci/job/functest-hunter-zip/33/console

    Change-Id: I40d1bf2dda46a81f6ef1870ae4b2f66bfc362ce5
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2b931c4..f24c4be 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2b931c4576d45848ea8d231dd5a4dd1fffd9ba88
+Subproject commit f24c4bedc3ea749bc90837f33707486b0e79c65d