Update git submodules

* Update docs/submodules/fuel from branch 'stable/fraser'
  - [ovn] Disable metadata agent

    OVN metadata agent is unsupported for pike.

    Change-Id: Id4781df6cdb7100567ac96500f988094c1699698
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index d385c0c..0ffd1bb 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit d385c0ca5a6650ed05744be545d52788a6b40b6d
+Subproject commit 0ffd1bb8558cb357734350d3e7e4dff30addd9d8