Description of problem:
When issuing upgrade on Satellite Capsule 6.3.2, the installer fails if it is unable to find the referenced certs.tar file in the capsule-answers.yaml file.

Version-Release number of selected component (if applicable):
6.3.2

How reproducible:
Everytime

Steps to Reproduce:
1. Remove the certs.tar file from the Capsule
2. Run the installer with the '--upgrade' flag
3.

Actual results:
Installer fails to find the certs.tar file and exits with the following:
The certs tar file generated by the server is not present at /root/capsule.redhat.com-certs.tar, exiting.
[ERROR 2018-07-09 16:15:54 verbose] The certs tar file generated by the server is not present at /root/capsule.redhat.com-certs.tar, exiting.

Expected results:
No issues

Additional info:
This is not a fresh install, and the Capsule server was already at version 6.3.2. The server has been a Capsule server since 6.2.0.

Workaround is to either comment out the 'certs_tar:' parameter in the /etc/foreman-installer/scenarios.d/capsule-answers.yaml file or remove the value from the parameter, then continue with the upgrade.