Comment 27 for bug 1891673

bionic-train verified with [Test Case] and output is:

# apt-cache policy neutron-common
neutron-common:
  Installed: 2:15.1.0-0ubuntu1~cloud1
  Candidate: 2:15.1.0-0ubuntu1~cloud1
  Version table:
 *** 2:15.1.0-0ubuntu1~cloud1 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-proposed/train/main amd64 Packages
        100 /var/lib/dpkg/status
     2:12.1.1-0ubuntu1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
     2:12.0.1-0ubuntu1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

# ./discover_ip_rules_affected_by_lp1891673.sh
Nothing to cleanup - exiting.