Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Unmask OpenDaylight service explicitly

    After salt update to version 2017.7.0 the indefinite mask
    has to be removed before attempting to start the service.

    Change-Id: I21616929f06f8ebd8a2d70e8c33f92c7b808a9c5
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index bf341b7..941a31e 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit bf341b7e0d7e423044827f379e4b180e9dc897a1
+Subproject commit 941a31e1e7f64f38a487b4e493bc25fdf29657da