Update git submodules

* Update docs/submodules/fuel from branch 'stable/euphrates'
  - [baremetal] MaaS: Fix DHCP dynamic reserved range

    - patch MaaS to default to `DHCP` instead of `AUTO` for physical
      PXE interfaces (all IPs will be handed out by MaaS DHCP *inside* the
      defined dynamic DHCP IP range);

    JIRA: FUEL-316

    Change-Id: I81fad333e77f7c8508cd2b2b267c7b39c130e3e1
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
    (partially cherry picked from commit 215a37d5)

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 78878a3..dac83c6 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 78878a33010e0bbec01196dfc5cc376567512376
+Subproject commit dac83c66fa36ce532f68710a630719b6d76a4702