Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge changes from topic 'fix-vm-on-jenkins'

    * changes:
      xci: xci-deploy.sh: Apply workaround for checking db cluster on SUSE
      xci: playbooks: synchronize-time: Fix service name for openSUSE
      xci: configure-opnfvhost: Do not run 'remove-folders'
      xci: scripts: build-dib-os.sh: Pin diskimage-builder
      xci: configure-opnfvhost: Do not check /etc/ssl/certs on SUSE

  - xci: xci-deploy.sh: Apply workaround for checking db cluster on SUSE

    The mysql socket path is wrong on SUSE which leads to problems when
    trying to verify the status of the db cluster. Apply workaround until
    it's fixed upstream

    controller00_galera_container-56c89184 | FAILED | rc=1 >>
    ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2 "No such file or directory")

    Change-Id: I23192f4079526ae7820a1db023a097a651a09140
Link: https://review.openstack.org/508154
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: playbooks: synchronize-time: Fix service name for openSUSE

    In openSUSE, the chrony service is 'chronyd'.

    Change-Id: Ifb946b0ba49783108a84dd5b998d9d45f5c9df51
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: configure-opnfvhost: Do not run 'remove-folders'

    The OPNFV node is brand new and it doesn't have any traces
    of XCI directories so there is no point in running the
    'remove-folders' role.

    Change-Id: Ic9b9203cc14abda2dab406de6a5feeef6a1b7e2a
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: scripts: build-dib-os.sh: Pin diskimage-builder

    diskimage-builder does very frequent releases and sometimes things
    break. There is no particular reason to always fetch the latest version
    so lets do it in a controlled way after proper testing.

    Change-Id: Ie9685a9a15fa7fefa1c5ecea49090ac9d92e63ff
    Signed-off-by: Markos Chandras <mchandras@suse.de>
  - xci: configure-opnfvhost: Do not check /etc/ssl/certs on SUSE

    This is similar to Ibc188b76f47c4f7d1c5aa452a21e838420d65e6a
    /etc/ssl/certs is a symlink so skip this task on SUSE.

    Change-Id: Iae38640501748dc3dd802ce795acfaeefd836c97
    Signed-off-by: Markos Chandras <mchandras@suse.de>