Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [odl] Add SDN_CONTROLLER_IP to openrc

    JIRA: FUEL-352

    Change-Id: I73aa5d41e93f3ebd5c8e44577868e8d21e0106a9
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index f288af0..7c6c58c 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit f288af04f48a2f8634ea4aefe7626774fde24058
+Subproject commit 7c6c58cc10c54b6d642d243ce7c63fb0a4e88e7c