Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge changes from topic 'split-variable-creation-to-task'

    * changes:
      xci: Move the destroy-env.sh script to xci-deploy.sh
      xci: provision-vm-nodes.yml: Merge plays

  - xci: Move the destroy-env.sh script to xci-deploy.sh

    There is no particular need to execute the bash script using Ansible.
    Lets move it to the xci-deploy.sh script instead.

    Change-Id: I0fa91195d9c3647bb4766d76c28892e2f13e1e98
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: provision-vm-nodes.yml: Merge plays

    There is no need to have multiple plays executed on a single host group
    so merge them all together into a single one.

    Change-Id: Ie190cdecfbdcba48f75b21aa5930e1d9b8392aa0
    Signed-off-by: Markos Chandras <mchandras@suse.de>