Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Merge "xci: kubespray: Generate and use SSL certificate for HAProxy"
  - xci: kubespray: Generate and use SSL certificate for HAProxy

    In the OpenStack-Ansible installers we are using the XCI ssl
    certificates for the endpoints but in kubespray we are generating them
    on the fly. In order to keep both setups as close as possible, we can
    use the XCI certificates in kubespray as well.

    Change-Id: I1ca55127fe747618205394c02b3d44bb573435f4
    Signed-off-by: Markos Chandras <mchandras@suse.de>