Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [baremetal] Link br-ex as ovs port

    Add br-ex and physical public interface
    as ports directly to ovs bridge.

    Change-Id: I12c078d3e286af7c5fa3078cc055905c03cf600b
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index ae4434b..b49bc80 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit ae4434bdf6a96e06286409aa51e8cd9975f7e8b8
+Subproject commit b49bc80c8a491a88ddb93ce6f60ba73a208fdd4f