Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Create a role which prepares xci for functest

    Functest requires xci deployment to have:

    - A public neutron network
    - A subnet attached to the public neutron network
    - The gateway from the subnet attached to one interface

    The network and subnet creation are done via a script
    instead of using Ansible OpenStack module in order to
    get things working asap.

    These three tasks are implemented in a role

    This patch depends on a pending patch:

    https://gerrit.opnfv.org/gerrit/#/c/39517/2

    Change-Id: I0635227153087fd9e25b76f0859f82bf48bfb930
    Signed-off-by: Manuel Buil <mbuil@suse.com>
    Signed-off-by: Fatih Degirmenci <fatih.degirmenci@ericsson.com>