Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Revert "Apply apache state on proxy nodes"

    Upstream fixed the salt-formula-horizon in commit 95387ec, by
    defining 8078 (and only that) port in Apache's ports.conf.
    This fixes the port 80 overlap, so running the `apache` high state
    after the `horizon` high state not only is unnecessary now, but
    also would lead to new breakage, since `apache` state would
    overwrite the ports.conf (removing 8078 and adding 80), i.e.
    creating a new port conflict and breaking Horizon port completely.

    This reverts commit eb4645206d6d74992fca3b8726ee2eebca97205f.

    Conflicts:
    	mcp/config/states/openstack_ha
    	mcp/reclass/classes/cluster/baremetal-mcp-ocata-common/openstack_proxy.yml

    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    Change-Id: Iea8f0bd90ee8d12f399aad16247dda274d6a907a
    (cherry picked from commit 0c71112ec06bd73a3ddc42ba0aacd666e9a00553)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index a56f663..b4cb2de 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit a56f66307f265b5e5f3f32cee9fe19a3c717b1d7
+Subproject commit b4cb2de10a932439d6089294f7bf29f01f6602da