Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "[Baremetal] - Change roles and playbooks names"
  - [Baremetal] - Change roles and playbooks names

    A few playbooks and the create-vm-nodes role should change the name to
    reflect the new reality once the baremetal patches are merged. The
    playbooks that must change the name are:

    - xci-prepare-virtual.yml
    - xci-create-virtual.yml

    Change-Id: Iaed1f93561fa9d39c7916e0643a5445cdddf4f97
    Signed-off-by: Manuel Buil <mbuil@suse.com>