Update git submodules

Update git submodules

* Update openstack-ansible from branch 'master'
  to 4c6664210068b66cb32268f65b5f20eaf7cadd64
  - Merge "Do not define openstack_pki_san in integrated repo"
  - Do not define openstack_pki_san in integrated repo

    Explicit definition of `openstack_pki_san` in integrated repository is
    reduntant because all service roles using PKI role already have a
    `default()` filter applied that matches the value of `openstack_pki_san`
    in integrated repo.

    Example:

    ```
    placement_pki_san: "{{ openstack_pki_san | default({'dns': [ansible_facts['hostname']], 'ip': [management_address]}) }}"
    ```

    It's not necessary to define `openstack_pki_san` in integrated repo.
    This patch removes it. However, it still can be used by the users to
    override cert SAN globally for all openstack services.

    Change-Id: Ia00c9c8a22218bc3ad2b37fc824eaa40430f5fe2
    Signed-off-by: Damian Dabrowski <damian.dabrowski@cleura.com>