Update git submodules

* Update docs/submodules/releng from branch 'master'
  - run tox with 'sudo'

    Change-Id: Icdbab7405e8dd46e7cd659dce04bf7502424192c
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cb5f2f6..50151eb 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cb5f2f65722e5f30812145cc612b69dbf04c19e3
+Subproject commit 50151eb3717edd4ddd996f3705fbe1732de7f3b7