Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: playbooks: Copy scenarios instead of symlinking them"
  - xci: playbooks: Copy scenarios instead of symlinking them
    
    Previously, the scenarios were symlinked from the checked out location
    to {{ playbook_dir }}/roles. However, the symlinks were pointless since
    they only exist in our local releng-xci directory. The roles much also
    be present in OPNFV_RELENG_PATH which is the place where the deployment
    happens. We use 'rsync' to copy our local releng-xci directory to the
    remote one so our roles can be automatically be placed there if we copy
    them instead of symlinking them.
    
    Change-Id: I735db71eedfaa51d7196761aa2af8329d86cb775
    Signed-off-by: Periyasamy Palanisamy <periyasamy.palanisamy@ericsson.com>
    Signed-off-by: Markos Chandras <mchandras@suse.de>
    

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