Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Disable notebook preview job"
  - Disable notebook preview job

    - the job does not work for patch with *.ipynb deletion
    - qtip has migrated to rst for formula display

    Change-Id: I4882f55ac7d9d4430a15c1f0237e0b9d6e223f47
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 4c1354f..bd62919 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 4c1354fe3f3dd7d2d7c4fcee7f96bbdbab5bae4c
+Subproject commit bd629199ec422bc8d89823c44e158cd53bb5d532