Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 54ee9047e99b3e26358ed431131a578762c19cc8
  - Merge "Protect all clean operations"
  - Protect all clean operations

    Change-Id: Ib4bfb73b2770e893cf3bdbfb4ecc05d3454036cd
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 5c8d320..54ee904 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 5c8d3206fd8fcfda8bb275b551e349ce59ecc10c
+Subproject commit 54ee9047e99b3e26358ed431131a578762c19cc8