Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge changes from topic 'move-sourcing-files'

    * changes:
      xci: Move the rest of functions to xci-lib.sh
      xci: file: xci-lib.sh: Avoid sourcing xci-lib.sh twice
      xci: Move sourcing of configuration files to the install-lib.sh

  - xci: Move the rest of functions to xci-lib.sh

    The xci-deploy.sh contains several functions used throughout in the
    XCI deployment so we should move thse to xci-lib.sh file.

    Change-Id: Iae6751619beea85b894900e5cd2f91a433410f66
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: file: xci-lib.sh: Avoid sourcing xci-lib.sh twice

    The file can be sourced from multiple places so we need to avoid
    sourcing it twice.

    Change-Id: I7d47f3d7e461d90d5456c95a1f7a791b4e3a2bde
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: Move sourcing of configuration files to the install-lib.sh

    The install-lib.sh assumes that certain configuration files have been
    loaded before it's sourced. However, this doesn't work well when other
    scripts are using install-lib.sh directly since they also need to load
    the same configuration files. As such, lets source all these
    configuration files from the install-lib.sh file directly. We also
    rename this file to 'xci-lib.sh' since it's not just about installation
    helpers anymore.

    Change-Id: I35e1e804db06b2bb512e4991e5fdf21a72ffaadb
    Signed-off-by: Markos Chandras <mchandras@suse.de>