Add Duo Device Health and Mac Certifier x509 fingerprints

[mkienow-r7]

Description

Adds Duo Device Health and Duo Mac Certifier x509 fingerprints. This is being added in the go string format so that it isn't lost in my backlog. #360 needs to be addressed in the near future.

Motivation and Context

Improved coverage

How Has This Been Tested?

• bundle exec ./bin/recog_verify xml/x509_subjects.xml
• rake tests

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• [x] I have updated the documentation accordingly (or changes are not required).
• [x] I have added tests to cover my changes (or new tests are not required).
• [x] All new and existing tests passed.