Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: Fix checkout location for OpenStack-Ansible"
  - xci: Fix checkout location for OpenStack-Ansible
    
    The OPENSTACK_OSA_PATH only makes sense on localhost. As such, when we
    use it on playbooks that operate on remote hosts, the result is not
    predictable. However, we rsync the entire releng-xci repository to the
    opfnv host so we can make everything predictable by simply clone
    everything in advance in the .cache directory. That directory is then
    rsync'd to the opnfv host. As such, we can repurpose the
    OPENSTACK_OSA_PATH to point to the path into the OPNFV host. Moreover,
    all external repositories are being cloned to .cache/repos so we can
    eliminate some variables in order to simplify the code. Finally, we
    bring back the ability to use an external OSA repository for
    development purposes.
    
    Change-Id: Ieef3e22ae2085f6735185634d555cfc0d4b69b39
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    

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