Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - Update opendaylight version to nitrogen

    * use pseudo agentdb port binding controller instead of
      the deprecated network topology one
    * disable superfluous l2population mechanism driver
    * tidy up the duplicated haproxy neutron listen opts
    * straighten karaf features list
    * update jetty config

    Change-Id: Ifacf8de11eb56ab72df13a312151a510b280dea2
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit fca7d22742df82fc6e502b17ad45ebc11c0ba89b)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 5c7924b..09dfaf2 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 5c7924bda36eddd3ef8e714ac524458dacc26dcb
+Subproject commit 09dfaf22d3ee1867bb05ddbac00adccfeb24913f