Update git submodules

Update git submodules

* Update kolla-ansible from branch 'master'
  to 54796bb4b06f6f102779318b8e784a1182b24a65
  - Merge "Fixed kolla_externally_managed_cert behaviour"
  - Fixed kolla_externally_managed_cert behaviour

    With ``kolla_externally_managed_cert`` enabled, certificates and keys
    shouldn't be managed by kolla, but ProxySQL is copied over currently.
    This change fixes that.

    Closes-Bug: #2131993
    Change-Id: Ia143504d523e1593543a1214f8cc955c3f2a9a10
    Signed-off-by: fprzewozn <przewozny.franciszek@gmail.com>