Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Apply apache state on proxy nodes

    Apache module will take care of ports.conf file to prevent
    bind socket conflict between apache & nginx services.

    Change-Id: Ia76ec356002e1db0dabd20d8f355a1b16fc07b30
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 9e231d1..eb46452 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 9e231d1918d037902021aa92d0eca557bd1c5d3c
+Subproject commit eb4645206d6d74992fca3b8726ee2eebca97205f