Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge "[cleanup] FN VMs: Fold user-data templates"
  - [cleanup] FN VMs: Fold user-data templates

    While at it, retire obsolete MAAS_IP global variable and let mas01
    VM get a DHCP address from virsh-managed mcpcontrol network.

    Change-Id: Ifd85dbcab10894a5d0d675d37f0c35f09776d9b4
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index fd5dd04..798c781 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit fd5dd042186d04be3dd88b91d6208d4fbaf8bdec
+Subproject commit 798c781b97a6a92b01f3f4cd0c85b50e92648627