Update git submodules

* Update docs/submodules/releng from branch 'master'
  - use tox instead of functest for doctor CI jobs

    Change-Id: Ifbde5ebd12a7e7a040a0a3b2a3eeed532a11da73
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 2d3635e..0e0e0d4 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 2d3635eba79e3176a2da20b851144dcac7fce495
+Subproject commit 0e0e0d4cb71fb27b1789a2bef2d3c4ff313e67ff