Update git submodules

Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [baremetal] curtin: Bump salt-minion to 2016.11

    By default, MaaS formula will install Salt minion 2016.3 via curtin
    on physical nodes. 2016.3 does not properly support proxy_host
    config option, causing timeouts during `linux.system.repo` SLS apply.

    Change-Id: I3d6245f0d4b425170c43b3b62a21ad9acc6cb97e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit 6e0e518d43cecfb8f981dbd51326d8eae103720c)