Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[baremetal] Move salt master IP to PXE/admin"
  - [baremetal] Move salt master IP to PXE/admin

    Use PXE/admin network for salt traffic from/to all minions
    except cfg01, mas01.
    This allows us to drop the route to admin net from cfg01.

    Change-Id: Ic2526f1ff77afe5d92ced900971f4c8f78d2d8a2
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 8494ec2..a4abff1 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 8494ec245aa24f00f2412d0f9d1e1e32591708d7
+Subproject commit a4abff17c7b71408762353bb1ef52d9ffbec2fb7