Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Bug-fix: add support for buid_tag reporting"
  - Bug-fix: add support for buid_tag reporting

    JIRA: BOTTLENECK-158

    It seems the build_tag is not automatedly passed to docker.
    This patch is to try to pass build_tag to Bottlenecks docker.

    Change-Id: I783d6f0702040449b0385d11bca709f8cdbdd58a
    Signed-off-by: Yang Yu <Gabriel.yuyang@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index 052812b..db78f4c 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit 052812b538bc75a7c2b83eea634a1118d3f65059
+Subproject commit db78f4cfe91ecdfdb9a6a761c7d75622e667c3f0