Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Missing "-y" when install docker.io"
  - Missing "-y" when install docker.io

    Change-Id: I1c94d148bf62aba6e21fcabe1908931c6732327f
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index e7d0ada..2144077 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit e7d0ada29bd6acf2dab0fb79b8cbfa3b4e20fa0a
+Subproject commit 214407724f73efd840e2f112e4849ff9c878c5ea