Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [baremetal] MaaS: Enable HTTP proxy
    
    Instead of using NAT on the mas01 node for all cluster node outgoing
    traffic, use the MaaS built-in proxy for APT traffic to leverage its
    caching capabilities too.
    Also enable the proxy for salt minions, so they can access public
    keyservers et al.
    Cleanup public DNS from kvm nodes, interferes with MaaS proxy.
    
    Add example config for global env proxy, but don't enable it:
    - default environment settings - /etc/environment (via reclass);
    
    The MaaS proxy will not be used (at least for now) on nodes:
    - cfg01;
    - mas01;
    
    NOTE: We can't yet drop the maas.pxe_nat state completely, as certain
    Openstack services are still accessed via public addresses from ctl
    nodes.
    
    JIRA: FUEL-317
    JIRA: FUEL-318
    
    Change-Id: I6c5f6872bb94afb838580571080e808bc262fc68
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    

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