Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Order euphrates build alphabetically

    Change-Id: I32506e0cad8215e0b16814035b9faec3a86ec4b5
    Signed-off-by: Yujun Zhang <zhangyujun@gmail.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 3daad1e..aeb2fa1 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 3daad1ec08f420006dbc805a42c1c3310de7c89c
+Subproject commit aeb2fa169ad452f0031ee6582fe1c9b4f47f68c2