Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - Add ports to ovs bridge config

    To avoid race with interfaces initialization specify all
    the ports that belong to a bridge in the config file.

    Change-Id: Ie4f48e7a81d4659a0f43749cdd518dbeffe2e35f
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit 9c9a1adc6f2501507a68b1926ea93efcb40782d1)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 8f97ead..270720d 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 8f97ead1ee10e6580f42de0e42412edcb4d91168
+Subproject commit 270720d0a7a040424c9cf8ff000d5262cfa60d29