Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 93a2fd47838d756117e6045a91798cb92dcda870
  - Fix build_args logic

    Change-Id: I9e45242fe77b600216d5d5759c13a5b817a11142
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index dece253..93a2fd4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit dece25372d52734a58f00bb1547195e9e138625a
+Subproject commit 93a2fd47838d756117e6045a91798cb92dcda870