Description of problem:

When using custom certificates the installer runs katello-certs-check to make sure the certificates are valid. A regression introduced in foreman-installer 3.4.0 caused it to continue execution after katello-certs-check has failed.

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

foreman-installer 3.4.0 - 3.7.0

How reproducible:

Always

Steps to Reproduce:
1. Create certificates that fail katello-certs-check
2. Run the installer with those custom certificates

Actual results:

Installer shows the errors and continues

Expected results:

Installer halts after showing katello-certs-check errors