* Rename files to match test suite and existing pattern
* Factor out issuer loading into a dedicated function
- Add a little more checks/validation when loading the a PKI issuer
- Factor out the issuer loading into a dedicated function
- Leverage existing health check code to parse issuer certificates
* Read parent issuer once instead of reloading it for every child
- Read in our parent issuer once instead of running it for every child
we want to compare against
- Provides clearer error message that we have failed reading from which
path to the end user
* PR Feedback
- Rename a variable for clarity
- Use readIssuer in the validation of the parent issuer within
pkiIssuer
- Add some missing return 1 statements in error handlers that had been
missed
