Improve Chromecast x509 issuer fingerprinting

[jvoisin]

Description

Improve Chromecast x509 issuer fingerprinting

How Has This Been Tested?

On my lan

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.

[adungo-r7]

Hello, it seems one of the Jenkins jobs for checking standardization is failing due to it detecting a new attribute. Could you add the new chromecast.codename identifier in the fields.txt file here: https://github.com/rapid7/recog/blob/f289c62a0281f1034b42b0c2a40f9c97f25ccf99/identifiers/fields.txt#L7 That should fix the issue. Thanks 🙂