Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Change nginx configuration"
  - Change nginx configuration

    Since landing page have changed from reporting2 to testing,
    the nginx configuration need some adoption.

    If the pre url change again, we need to config the base_url when start
    our docker container. For example:
        docker run -itd -p 8084:8000 -e SERVER_URL testresults.opnfv.org/xxx/api opnfv/reporting:latest

    Change-Id: If3c9f9af76fcfc8047b5b9559fcc8bd45740d4d2
    Signed-off-by: chenjiankun <chenjiankun1@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index c4dbd34..b584f4d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit c4dbd3450cb914c2b1e6bf4ba66a220082cfec09
+Subproject commit b584f4d1b522b2dc62b664c5dca33e121a2efab2