Update git submodules

* Update docs/submodules/fuel from branch 'master'
  - Merge changes from topic 'baremetal-noha'

    * changes:
      [states] baremetal_init: Parameterize kvm hosts
      [scenarios] Differentiate virtual node roles

  - [states] baremetal_init: Parameterize kvm hosts

    Instead of hardcoding the 'kvm' hostnames, use new targeting
    mechanism based on scenario-specific node names, preparing for
    baremetal noha scenario integration.

    JIRA: FUEL-382

    Change-Id: If336aa1ac130749e4df7bffaf27a55513dd4f267
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>
  - [scenarios] Differentiate virtual node roles

    Split scenario yaml definitions for virtual.nodes based on node
    role ('infra', 'control' or 'compute'), to be leveraged later to
    contruct node lists based on said role.

    This moves the responsability of filtering node names in scenario
    files (based on 'virtual' or 'baremetal' type) to xdf_data.sh.j2,
    simplifying scenario templates.

    By keeping all nodes (both virtual and baremetal) in scenario files,
    we can later determine the role (and implicitly the hostname) for a
    MaaS-managed node based on its index in the virtual.nodes.control
    structure.

    JIRA: FUEL-382

    Change-Id: I1f83a307631f4166ee1c57ef598c44876b962f97
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/fuel b/docs/submodules/fuel
index 143bf77..6a3bbf9 160000 (submodule)
--- a/docs/submodules/fuel
+++ b/docs/submodules/fuel
@@ -1 +1 @@
-Subproject commit 143bf770cf104daaf8d457a3de294d6acb33f9cf
+Subproject commit 6a3bbf95c70207a146c5b2c82d8518cf02e5c269