Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "bugfix: pass functest parameters to builders"
  - bugfix: pass functest parameters to builders

    As doctor CI failed: https://build.opnfv.org/ci/job/doctor-verify-apex-sample-build-x86_64-master/24/console
    Functest parameters can not passed to 'functest-suite-builder' to build the job

    Change-Id: I34039025bb77e78ce43c21ef7ec67da7583b6e39
    Signed-off-by: dongwenjuan <dong.wenjuan@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 98001aa..6be1d52 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 98001aa4f1fbe033d80b812aa74c760de4f2c187
+Subproject commit 6be1d52e6af507f7dad6d0ec9c1f4628f5eaba06