Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [ha] Fix openstack_ha ovn setup

    Fix targeting for neutron.compute sls for ovn computes,
    avoiding interaction with ovs dpdk scenarios.

    JIRA: FUEL-329

    Change-Id: Iffb07f6f0d4dc8071437adf59d4cd6982113b998
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    Signed-off-by: Guillermo Herrero <guillermo.herrero@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index ab9ccfd..ff8fe89 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit ab9ccfdc387c02a42c89e8770c26634f3e6c5ceb
+Subproject commit ff8fe897ccaf4c70a5c68114d8a647d59edd75ba