Description of problem:

Satellite upgrades are a two step process. Since customers are at a high risk for not running both, we are asking that after a yum update on the satellite a warning is shown that they must complete the upgrade or the Satellite will not be functional.

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

How reproducible: 100%

Steps to Reproduce:
1. yum update on satellite 6
2. do not run the katello-installer --upgrade or satellite-installer --scenario satellite --upgrade

Actual results: Satellite is half updated and will have multiple failures in hammer ping

Expected results: a banner or warning on the satellite page that says "finish the upgrade with satellite-installer --scenario satellite --upgrade"

Additional info: This is a feature gap between Satellite 5 and Satellite 6. If a update is done on Satellite 5 a banner will come across the screen and state please perform a database schema upgrade.

See also https://bugzilla.redhat.com/show_bug.cgi?id=1184568