Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - [ha] Get OVS 2.9 & DPDK 17.11 from UCA repo

    * to be compatible with HWE kernel
    * make neutron balancing to RR back
    * turn off glance v1 api support (doesn't relevant for now)

    Change-Id: I916aae10f523be339c20de32218ce03c245afe72
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 13325ad..a40e50c 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 13325ade9e4d2ea1046062e4efce9c54c8d877cd
+Subproject commit a40e50c04f27e322e3b4f4e96fe61b78f420937d