Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Use http instead of https as a workaround for certificate error"
  - Use http instead of https as a workaround for certificate error

    Got an SSL error when loading content from https://artifacts.opnfv.org [1]
    HTTPS is not a must for this use case, so use http instead to solve this issue.

    [1] https://nbviewer.jupyter.org/urls/artifacts.opnfv.org/qtip/review/37731/compute-qpi-report/report.ipynb

    Change-Id: I8b09eb2d1da234c17843f2cb7504a3b1ded9017e
    Signed-off-by: Yujun Zhang <zhang.yujunz@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 24e14a2..1cd26a7 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 24e14a257b9ab64fb9a5d41beb986847b60ec4d2
+Subproject commit 1cd26a7dd63cdd0f2c3c4dba3b0264058220ffe5