Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Add set -o to daisy4nfv-build.sh"
  - Add set -o to daisy4nfv-build.sh

    By using set -o, this can prevent CI from uploading *.properties
    files without *.bin to artifact.opnfv.org if build was failed.

    This once happened to [1].

    [1] http://artifacts.opnfv.org/daisy/opnfv-2017-04-25_06-57-05.properties

    Change-Id: I26c3112af1d73a84df05c3852038c99d7070ab59
    Signed-off-by: Zhijiang Hu <hu.zhijiang@zte.com.cn>