Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Remove opendaylight service mask

    Nitrogen SR2 brought in weird behaviour into netvirt feature
    configuration causing malfunction tunnels between client nodes
    (e.g. gateway, computes). In order to work properly service
    of opendaylight requires an explicit restart or reload by means
    of salt formula.

    Change-Id: I277da5ad2787f1005647e500b64c7ffa6051443b
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 5d359f3..3fdf9a9 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 5d359f3396e5ca22b1aab2336c16908d7a5fd962
+Subproject commit 3fdf9a951e8c7f5387b90d020ea6db38d85f3dd4