Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: osa: Simplify OpenStack host playbooks"
  - xci: osa: Simplify OpenStack host playbooks

    The configure-targethost playbook is configuring all the OSA hosts so
    we can simplify all that by introducing a new 'openstack' host group
    with the controller and the compute nodes and configure all of them
    in parallel.

    Change-Id: I21f8709e7649b041575dab45fc4e070aa01e0a6f
    Signed-off-by: Markos Chandras <mchandras@suse.de>