Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [ovs/dpdk] Add missing rootwrap sudoers policy

    Append required sudoers rule since uca package version
    of neutron has no policy for neutron-rootwrap-daemon.

    Change-Id: Id8ea5b1b6aadb9eca879d72ce4d158a7bc01060e
    Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
    (cherry picked from commit a05f8d2682f2449d7d10e52038c56a0af6357def)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 3e423ea..4dcd2f1 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 3e423ea189bdb00e648a263a6c31a285661e736b
+Subproject commit 4dcd2f1b46dfe70841e017463166e600a753f19d