Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[ovn] Enable metadata agent"
  - [ovn] Enable metadata agent

    Change-Id: I9ef3a1dd570abf90b222609af350565d385326c8
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 7e3b3b7..c85e28e 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 7e3b3b75f09dbda98f0d65c1517c2188e7c3e5c5
+Subproject commit c85e28ea54c73e66b264adc11c38ba638397984e