Update git submodules

Update git submodules

* Update docs/submodules/multicloud/k8s.git from branch 'master'
  to c1963d4331fce447d93131d731e1f261c175de87
  - Merge "Make ovn-central network interface configurable"
  - Make ovn-central network interface configurable

    installer.sh script is configuring ovn-central address <ip>:<port>
    to environment variable.
    Ip address is detected from the ovn-central host through ansible
    by grepping ifconfig output, but in this step detected network
    interface is hard-coded in the code to be "eth1".

    This commit makes network interface configurable in aio/vagrant
    deployment.

    Issue-ID: MULTICLOUD-621

    Change-Id: Icbe22ffdcb45c5f16067ea609eec76fb70c0ea78
    Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>