Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "[Functest] Add huawei-virtual5 for alpine testing"
  - [Functest] Add huawei-virtual5 for alpine testing

    Change-Id: I5ce29cbb0786e83fbdf5bd014daf6686ec435562
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4cee4da..638edb3 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4cee4da93c7b1b81eb206a0650a857902d096058
+Subproject commit 638edb3eb22ace17c80852fa0d586f12595e2662