Bump neutron containers + Fix etcd backend_url

• https://github.com/stackhpc/kolla/commit/cd4e843638f92c64ad8db8caa5dccf7f5f089f51
• https://gitlab.com/scientific-openstack/infrastructure/kayobe-config/-/commit/265137dee285935e718062167e14db0cb458e681

Build logs:

• centos 7: https://gitlab.com/scientific-openstack/infrastructure/kayobe-config/-/jobs/2727956842/artifacts/browse/artifacts/
• centos 8: https://gitlab.com/scientific-openstack/infrastructure/kayobe-config/-/jobs/2721852494/artifacts/browse/artifacts/