Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Update bifrost SHAs

    There is a bug when ironic communicates with rabbitmq due to a parameter
    deprecation. This patch fixes it:

    https://review.openstack.org/#/c/609499/

    And we can take the opportunity to update all SHAs

    THere is a problem:

    "Unable to retrieve file contents\nCould not find or access '/home/opnfv/releng-xci/xci/infra/bifrost/playbooks/roles/common/venv_python_path.yml'"}

    That file is in:

    /home/opnfv/releng-xci/.cache/repos/bifrost/playbooks/roles/common/venv_python_path.yml

    As I am not sure how to fix the ansible PATH, for the time being, I just
    added to where Ansible is searching for it

    Change-Id: I8e60f43ed7fc78a8925efaa36e41b0d872ea9a74
    Signed-off-by: Manuel Buil <mbuil@suse.com>