Update git submodules

Update git submodules

* Update docs/submodules/compass4nfv from branch 'stable/danube'
  - change the package url

    We moved the master package repository from <http://205.177.226.237:9999>
    to <http://205.177.226.237:9999/master>. When we build the master ISO,
    we need download the package from new URL.
    Add md5 checksum after downloading package.

    Change-Id: Ia6d8a217569e6e8dc676b1290e583348a7b9c347
    Signed-off-by: wutianwei <wutianwei1@huawei.com>
    (cherry picked from commit 8bc2146293461a619b5c5516a09d2915effbc19f)