Update git submodules

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>