Description of problem:
All the time customers are looking for a way to check the last_checkin just to remove the content host automatically (based on timeframe). For example, virt-who-* servers, hypervisors with more than 10 days without checking could be removed.

Version-Release number of selected component (if applicable):
6.6.z

How reproducible:
100%

Steps to Reproduce:
1. We don't have this report available.
2.
3.

Actual results:
not available

Expected results:
List of content hosts with last_checkin
---
[root@wallsat66 ~]# echo "select h.name,h.id,ksf.host_id,ksf.last_checkin,ksf.hypervisor from katello_subscription_facets as ksf, hosts as h where h.id=ksf.host_id and ksf.hypervisor='t' order by ksf.last_checkin" | su - postgres c "psql foreman"
name | id | host_id | last_checkin | hypervisor
----------------------------------------------------------+---------------------+------------
virt-who-esxi1.lab.eng.rdu2.redhat.com-1 | 16 | 16 | 2020-01-10 18:36:44 | t
virt-who-esxi2.lab.eng.rdu2.redhat.com-1 | 17 | 17 | 2020-01-10 18:36:44 | t
virt-who-esxi5.lab.eng.rdu2.redhat.com-1 | 19 | 19 | 2020-01-10 18:36:44 | t
virt-who-newserver.lab.eng.rdu2.redhat.com-1 | 18 | 18 | 2020-01-10 19:37:04 | t
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Additional info: