Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - xci: Drop AIO specific playbook

    The configure-opnfvhost playbook which is used for all flavors except
    AIO can also be used for AIO if it's adapted to not configure networking
    on the host and also do not fail if there aren't any OSA variables files
    available so lets do all that in order to avoid duplicating code across
    flavors.

    Change-Id: I58379d8b52094294b9349494753ffcdd44982013
    Signed-off-by: Markos Chandras <mchandras@suse.de>