Update git submodules

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)