Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Use local repository for docker build"
  - Use local repository for docker build

    Change-Id: I789aa64f0f5443aee5178f98ce36e07f3b786c15

diff --git a/docs/submodules/releng b/docs/submodules/releng
index de475ca..f47a682 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit de475ca391c9b11a3e76d36487e3b2ee06f364a1
+Subproject commit f47a682614fa0d68fb5bba6abeacb2fcf87ee537