Description of problem:
RHEL lifecycle status shows Unknown for the register hosts

Version-Release number of selected component (if applicable):
Sat 6.15

How reproducible:
Register a host to the Satellite 6.15

Steps to Reproduce:
1. Go to Hosts -> Content Hosts -> Host status
2. Click on Manage all statuses
3. RHEL lifecycle: Unknown

Actual results:
RHEL lifecycle: Unknown

Expected results:
RHEL lifecycle: full_support

Additional info:
Output should be either:

full_support
maintenance_support
approaching_end_of_maintenance
extended_support
approaching_end_of_support
support_ended

QE Tracker for https://issues.redhat.com/browse/SAT-21900
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2254491