Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "allow authentication to be disabled"
  - allow authentication to be disabled

    in local deployment situation, authentication can be disabled by
    setting authenticate=False of ui section in config.ini

    JIRA: RELENG-324

    Change-Id: I9157d1723851feb12435033dbdd59035e3eb5777
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ca745db..5ec8f63 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ca745dbf6dd3dbc5642fae6b6397e878b6eb8aca
+Subproject commit 5ec8f63f0d6c2980f3ebe27572e1a3ad7e16a824