Update git submodules

* Update docs/submodules/releng from branch 'master'
  - specify the cacert file when it exits

    Change-Id: Id122d99d6e599c31d3b5970aa88307843d379515
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ef4f36a..3547754 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ef4f36aa1c2ff0819d73cde44f84b99a42e15c7e
+Subproject commit 3547754e808a581b09c9d22e013a7d986d9f6cd1