Update git submodules

Update git submodules

* Update docs/submodules/pharos from branch 'master'
  - [fuel] Add proxy node management network VIP

    Change-Id: I5fd74163cab8f6ee5f575ed72edfcc6919e60161
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - [fuel] Update MaaS PXE config

    - reduce DHCP range to silence a dummy MaaS warning about address exhaustion;
    - define PXE/admin address for Salt Master node;
    - drop obsolete opnfv_infra_maas_pxe_address;

    JIRA: FUEL-316

    Change-Id: Ic946960aac3c09dbcfce005098a5fc97396da01e
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>