[ubuntu-binary] swift-object-expirer package is missing

This bug is similar to https://bugs.launchpad.net/kolla/+bug/1630425 but exists in the ubuntu containers.

Our swift-object-expirer container is stuck in a restart loop printing out the following debug:

  ++ cat /run_command
  + CMD='swift-object-expirer /etc/swift/object-expirer.conf --verbose'
  + ARGS=
  + [[ ! -n '' ]]
  + . kolla_extend_start
  + echo 'Running command: '\''swift-object-expirer /etc/swift/object-expirer.conf --verbose'\'''
  Running command: 'swift-object-expirer /etc/swift/object-expirer.conf --verbose'
  + exec swift-object-expirer /etc/swift/object-expirer.conf --verbose
  /usr/local/bin/kolla_start: line 18: exec: swift-object-expirer: not found
  + sudo -E kolla_set_configs
  INFO:__main__:Loading config file at /var/lib/kolla/config_files/config.json
  INFO:__main__:Validating config file
  INFO:__main__:Kolla config strategy set to: COPY_ALWAYS
  INFO:__main__:Copying service configuration files
  INFO:__main__:Deleting /etc/swift/account.ring.gz
  INFO:__main__:Copying /var/lib/kolla/swift/account.ring.gz to /etc/swift/account.ring.gz
  INFO:__main__:Setting permission for /etc/swift/account.ring.gz
  INFO:__main__:Deleting /etc/swift/container.ring.gz
  INFO:__main__:Copying /var/lib/kolla/swift/container.ring.gz to /etc/swift/container.ring.gz
  INFO:__main__:Setting permission for /etc/swift/container.ring.gz
  INFO:__main__:Deleting /etc/swift/object.ring.gz
  INFO:__main__:Copying /var/lib/kolla/swift/object.ring.gz to /etc/swift/object.ring.gz
  INFO:__main__:Setting permission for /etc/swift/object.ring.gz
  INFO:__main__:Deleting /etc/swift/swift.conf
  INFO:__main__:Copying /var/lib/kolla/config_files/swift.conf to /etc/swift/swift.conf
  INFO:__main__:Setting permission for /etc/swift/swift.conf
  INFO:__main__:Deleting /etc/swift/object-expirer.conf
  INFO:__main__:Copying /var/lib/kolla/config_files/object-expirer.conf to /etc/swift/object-expirer.conf
  INFO:__main__:Setting permission for /etc/swift/object-expirer.conf
  INFO:__main__:Writing out command to execute
  ++ cat /run_command
  + CMD='swift-object-expirer /etc/swift/object-expirer.conf --verbose'
  + ARGS=
  + [[ ! -n '' ]]
  + . kolla_extend_start
  + echo 'Running command: '\''swift-object-expirer /etc/swift/object-expirer.conf --verbose'\'''
  Running command: 'swift-object-expirer /etc/swift/object-expirer.conf --verbose'
  + exec swift-object-expirer /etc/swift/object-expirer.conf --verbose
  /usr/local/bin/kolla_start: line 18: exec: swift-object-expirer: not found

I manually built the swift containers from the master branch of openstack/kolla using this command

   python tools/build.py -b ubuntu swift

I then ran the resultant container:

   docker run --rm -it --entrypoint=/bin/bash kolla/ubuntu-binary-swift-object-expirer:9.1.0

I cannot find the swift-object-expirer executable in the container. However, after installing the missing package the command is usable

  apt-get update
  apt-get install swift-object-expirer

  swift-object-expirer
  Usage: swift-object-expirer CONFIG [options]

  Error: missing config path argument

I assume there has been some change upstream which has resulted in this executable being packaged as its own Debian package. This means the install commands in the Dockerfile are no longer installing the correct package:

  {% if install_type == 'binary' %}
      {% if base_package_type == 'rpm' %}
          # RDO packages swift-object-expirer in openstack-swift-proxy
          {% set swift_object_expirer_packages = ['openstack-swift-proxy'] %}
      {% elif base_package_type == 'deb' %}
          {% set swift_object_expirer_packages = ['swift-object'] %}
      {% endif %}

  {{ macros.install_packages(swift_object_expirer_packages | customizable("packages")) }}

  {% endif %}