Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add support for review jupyter notebook from nbviewer"
  - Add support for review jupyter notebook from nbviewer

    It is done by uploading the notebook under reviewer to artifacts
    and add the nbviewer link in gerrit comments

    It is needed because reviewing jupyter notebook[1] directly in
    gerrit is very difficult. See example in [2]. It will be much
    easier if we can preview the result in nbviewer. See example in [3]

    [1]: http://jupyter.org/
    [2]: https://gerrit.opnfv.org/gerrit/#/c/37227/
    [3]: https://nbviewer.jupyter.org/urls/git.opnfv.org/qtip/plain/examples/storage-qpi-report/storage-qpi.ipynb

    Change-Id: I3e4c301f362ff6ac97aebc9d09c7103278efb136
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index f407762..85442f1 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit f4077629308e7374d9e92923af996cf7bf79678c
+Subproject commit 85442f1149313afa1806769c124c1c0b0b0853e5