Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 771e830d60ab145538777ce8501aa09e4a2b2d1c
  - Merge "Apply new env and volume regexes"
  - Apply new env and volume regexes

    Change-Id: I622d6e9f61c1a4fc1b9b6b2715eaa4d435a2e446
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index eb8bcf3..771e830 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit eb8bcf335ac1f3629017b2cd21e19fb636b22630
+Subproject commit 771e830d60ab145538777ce8501aa09e4a2b2d1c