Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [odl-router] Add missing nodes config

    Change-Id: Id7603aa581e4ccdddad1cf93f9434fe95c047800
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index bba5e84..4c4b671 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit bba5e84824a07416db140aa63b27ee6fc6e903cd
+Subproject commit 4c4b6719b43b399a9478df18ed95a6bac148e775