Update git submodules

Update git submodules

* Update docs/submodules/domino from branch 'stable/danube'
  - bring danube branch up to date with master

    Gerrit doesn't like merge commits

    eg: this wont work

    git merge origin/master --no-commit
    git commit -sv
    git review stable/danube

    So I took the diff
    git diff origin/stable/danube..master
    and checked out the files that were changed
    git checkout origin/master -- featureconfig.rst

    normally you should checkout the change sets and resolve the
    merge conflitcs, but in this case we dont care.

    Change-Id: I2a02e8ae7237825911f22663a5c65cdb9f5c5e4f
    Signed-off-by: agardner <agardner@linuxfoundation.org>