Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Use Dovetail aarch64 docker image with armband pod"
  - Use Dovetail aarch64 docker image with armband pod

    Change-Id: I8ce34880b78daaaf0bf22674d26e1d8f8f41614c
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 79715f6..8bb5b1f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 79715f619ee9f6b83b84bafd04f9b07ac3a78f2d
+Subproject commit 8bb5b1f2154da334570c5791a6a9a8ad43e829af