Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Clean up opendaylight configuration

    * remove client patch (has been merged to upstream)
    * websocket now is disabled by default
    * purge deprecated/unneeded features (odl-mdsal-apidocs, odl-dlux-all)

    Change-Id: Id247a3c74e66730049bfeafc4a5164aad0d9b662
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 9c9a1ad..0a8568d 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 9c9a1adc6f2501507a68b1926ea93efcb40782d1
+Subproject commit 0a8568d9f170d6c3b42d2dd35db440b4251f9a5d