Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - reclass: Drop MaaS public IP and interface

    MaaS node does not need to be exposed to the public network; instead
    the management IP should be enough to access the MaaS dashboard.

    So, drop 'infra_maas_node01_external_address' reclass param, together
    with its OPNFV PDF param, 'opnfv_infra_maas_node01_external_address'.

    This allows us to move compute public IPs back to .{2,3} instead of
    .{101,102}, where we moved them during 'pod_config.yml' addition.

    While at it, fix a minor duplicate 'name' param for 'br-mgmt' bridge
    on kvm nodes.

    Change-Id: Ie9fcf5924d7aa37b666f42c968687d73b51a8278
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (cherry picked from commit ee4d89f2803085bdd4a7f3b365e40ec9366c25a9)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 3a6f5b7..1e7d57e 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 3a6f5b7ace228900218f2833905872356ed9ae03
+Subproject commit 1e7d57ed87857c65613f83532d46b5d3721174ef