Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Remove SERVER_URL in reporting deploy job

    Since we improved the reporting deploy way, the SERVER_URL is set
    to http://testresults.opnfv.org/reporting2 by default. So we don't
    need to set it.

    So we have to ways:
    In CI:
        docker run -itd -p 8084:8000 opnfv/reporting:tag
    Personal use:
        docker run -itd -p 8084:8000 -e SERVER_URL={server_ip}:8084 opnfv/reporting:tag
        (8084 is the port mapping, you can change it)

    Change-Id: Ibe8adbb4601378d59d4d1fe6c7dd3266222c47d1
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b70dfce..961da26 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b70dfceea708abb23a5a66ffe0b8c547e111975f
+Subproject commit 961da26ee8049a3d6c9e7f17de9a12fa6e5cf266