Update git submodules

* Update docs/submodules/releng from branch 'master'
  to bba9fa36bb75a0eb1ec4e4f184881935e9e75c0f
  - Fix remaining '-' after diff operation

    Change-Id: I964de9b74a34b4e9176ecc6b56bbcf62fda5d5e4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4d2d133..bba9fa3 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4d2d133ac70b22a1f26f8045c7d66145c7a35d9d
+Subproject commit bba9fa36bb75a0eb1ec4e4f184881935e9e75c0f