Update git submodules

* Update docs/submodules/releng from branch 'master'
  - online bottlenecks soak throughtputs

    This patch is to online posca_factor_soak_throughputs testcase

    Change-Id: Ief6776e224c59de600fbe44709c767aecd01d0f0
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 112eb07..3a76d9e 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 112eb0719a5139191e7fd58a1a5b72bcb3a3694d
+Subproject commit 3a76d9e0aff0902c67cc6c22bed79f4a0a02211f