Debian: use caracal repos

Change-Id: Id1c028e0650c1fd3aa4c0a7b311a61b26057179c

Author: bbezak

docker/base/Dockerfile.j2

@@ -264,7 +264,7 @@ COPY sources.list /etc/apt/sources.list.d/kolla-custom.list
 
 RUN apt update \
  && apt install -y --no-install-recommends extrepo \
- && extrepo enable openstack_bobcat \
+ && extrepo enable openstack_caracal \
  && apt purge -y extrepo \
  && apt --purge autoremove -y \
  && apt clean