Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Disable strict host key checking for galera cluster check

    The command to check the galera cluster fails due to having strict
    host key checking enabled.

    This change disables strict host key checking for galera_container
    to ensure we can verify if the database cluster is operational.

    OSA does this for aio on their gate and put host key checking
    configuration to group_vars which we might need to do as well.

    Change-Id: Ifc59581d979c71f1db1b87126659470dc85cc2db
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>