Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: config: evn-vars: Dynamically determine the Ansible version"
  - xci: config: evn-vars: Dynamically determine the Ansible version

    There is no good reason why we should pin the Ansible version without
    the ability to override it. OpenStack Ansible is doing a great work
    testing Ansible releases as early as possible so we could benefit from
    that work and use whatever Ansible our pinned OSA uses.

    Change-Id: I4677dbefc68f7140417ece34d013ca9674baab43
    Signed-off-by: Markos Chandras <mchandras@suse.de>