Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "bugfix: query doesn't work well with period=1"
  - bugfix: query doesn't work well with period=1

    when querying by date, if $lt is not provided,
    the empty/None/null/'' results will also be returned,
    the patch aims to fix this issue by adding
    $lt = datetime.now() if not provided

    JIRA: RELENG-212

    Change-Id: Ida1e7d386a88d4ab640441df161c1fe134593f82
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 7d01201..b1b4c2d 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 7d01201372a7a04e8a0d109ebd25adea614914f6
+Subproject commit b1b4c2dd8a5532c65b5df46f14721a5a421682d3