Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "playbooks: configure-opnfvhost: Be explicit when copying user files"
  - playbooks: configure-opnfvhost: Be explicit when copying user files

    The flavors may contain deployment specific user_variables.yml files
    so we should only copy the generic one in the common tasks and leave
    the rest for scenarios to copy them if necessary.

    Change-Id: I39e3e090dc40d4f13bb42028a24e8574e19cf6dd
    Signed-off-by: Markos Chandras <mchandras@suse.de>