Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Nomination of Manuel Buil as XCI committer

    Manuel Buil has been crucial onboarding OPNFV SFC Project to XCI.
    His contributions include
    - creating os-odl-sfc scenario on XCI
    - developing role to integrate Functest into XCI
    - working on establishing XCI developer workflow by being first project
    to evaluate the XCI framework and provide feedback
    - reviewing changes

    His contributions can be seen from following link:
    https://gerrit.opnfv.org/gerrit/#/q/owner:mbuil%2540suse.com+project:releng-xci+status:merged

    Apart from contributions to XCI, he contributed to several upstream components
    in order to onboard SFC to XCI.
    - Taking over the Ansible Tacker Role implementation and finalizing it
    - Integrating Tacker into OpenStack Ansible
    - Enhancing Ansible Neutron Role and introducing ODL support

    His contributions to upstream projects can be seen from following link:
    https://review.openstack.org/#/q/owner:mbuil%2540suse.com+status:merged
    https://git.opendaylight.org/gerrit/#/q/project:integration/packaging/ansible-opendaylight+owner:mbuil%2540suse.com+status:merged

    Change-Id: I40756bfe5e7c962e6d8d6d5c3d53ef1699ae6428
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>