Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "jjb/releng: fix compass-container $DOCKERFILE"
  - jjb/releng: fix compass-container $DOCKERFILE

    Use default $DOCKERFILE setting from downstream projects.

    Change-Id: I0bfee5dcaef9a9eb7601548a1e5da5a5f8d51bb5
    Signed-off-by: Yibo Cai <yibo.cai@arm.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 8c1e5d2..baab3f7 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 8c1e5d21f6633c38fba0e97791b837f4691d952e
+Subproject commit baab3f70e234538d043b0cf76eb5c9773164da35