Update git submodules

Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to 38e2d7f5a687ad2869657e245ef2a55fa7aff50a
  - Switch to using gjjb maven-merge jobs

    This new Maven merge job type does away with the Jenkins Maven
    project type and is capable of deploying at end.

    Change-Id: I7a39adb4de59c5626913379927acbcf0e18e043a
    Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>
  - Update to global-jjb v0.13.1

    Pulls in the much awaited maven-merge job. We will deploy this to a
    few projects to test before making it available to all projects.

    Change-Id: Idcdf63bd76510481deef06c13fb9983a47e36486
    Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>