Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: Use local playbooks for XCI deployments"
  - xci: Use local playbooks for XCI deployments

    Previously, we used to clone the releng-xci repository under a directory
    in /tmp, copy our changes to that repository and then run the
    xci-deploy.sh script from it. However, this made things far too complex
    for deployers and developers since some playbooks were used from the
    local repo whereas others were used from teh /tmp checkout. By running
    everything from our local repository simplifies things a lot since we
    can directly test our changes and also reduces the code we have in our
    playbooks.

    Change-Id: If16aa51b2846c170676df82d25cb90e26b1568b2
    Signed-off-by: Markos Chandras <mchandras@suse.de>