Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "bugfix: leverage data_files to stop hacking setup.py"
  - bugfix: leverage data_files to stop hacking setup.py

    1) leverage data_files to distribute ui related files, and dispatch
    them under /usr/local/share/opnfv_testapi
    2) delete hacking coding, no more extra processes
    3) utilize MANIFEST.in to include 3rd_party when producing a source distribution

    Change-Id: Idb83a02be11f6b24610191e9f85e0db80d92e972
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index ab38b89..ca6539a 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit ab38b8924b8b39eb44201f9bfa41f009a3eea0a1
+Subproject commit ca6539a8f8c7f608623cdd578d2d606322f06370