Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "This job will allow projects to create custom docker jobs"
  - This job will allow projects to create custom docker jobs

    Just create these files in the root of your repo

    merge-docker.sh
    verify-docker.sh

    Then do what you want with docker

    triggers on changes in docker/*

    This will not be merged unless a project expresses interest.
    Multiple dockerfiles per project is now supported by old method.

    Change-Id: I68dcf373b4ddc4332ded97b81e00a2cf462917d6
    Signed-off-by: agardner <agardner@linuxfoundation.org>