This is just a small refactor to clean up a few things I noticed. I included some more unit testing as a bonus. This change shouldn't cause an externally-visible behavior change to zlint.

• Moves the check in e_ca_country_name_invalid for if there is actually a country included to CheckApplies(), since this check currently explicitly responds NA for that case
• Adds some new unit test cases to cover certificate with multiple countries included
• Add a test case for the effective date
• Refactors many of the existing unit tests (and the new ones) into a table-driven test based on feedback from Fix IV countryName lint checkApplies, add IV personal name lint history #1027
  • I generated the new certificates with P-256 keys to reduce the size hit to the code base.
• Fixes a typo in a comment in e_cab_iv_requires_personal_name