Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge changes from topic 'multiarch-image-defaults'

    * changes:
      reclass: virtual: Factor out VM interface naming
      reclass: Multiarch support for arch specific param

  - reclass: virtual: Factor out VM interface naming

    Define two groups of VM interface naming:
    - ens3..ens6 - used by infra VMs, virtual node VMs;
    - ens2..ens3 - used by VCP VMs (spawned by salt.control);

    Parametrize newly defined interface names throughout the cluster
    models.

    While at it, add AArch64 default values for above iface names.

    NOTE: baremetal clusters will be parametrized later, after common
    config is factored out into <baremetal-mcp-ocata-common>.

    Change-Id: I89aba9aaf85b585cc510302eb76d7810fbf60679
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - reclass: Multiarch support for arch specific param

    Introduce a simple mechanism that simulates an 'if-arch-then' cond
    for reclass models:
    - add new <all-mcp-ocata-common> class hierarchy;
    - at runtime (via <salt.sh>) make 'all-mcp-ocata-common.arch' point
      to 'all-mcp-ocata-common.$(uname -i)' dynamically;
    - inherit new 'arch' class in all cluster models;
    - factor out current x86_64 default for "salt_control_xenial_image";
    - add AArch64 default for param "salt_control_xenial_image";

    Change-Id: I3b239b28d0fd1cc2ced8579e2e93b764eb71ffc3
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 89bb73f..c2269d2 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 89bb73f0fba7d09591f52f5a513d1a846c373a8b
+Subproject commit c2269d2ed4f55ec051c058dc6b733f74d0d3eec3