Authority-mode keys and certificates should be owned by dirauth module
Right now these functions are defined in the relay module, when only dirauths need them:
- get_my_v3_authority_cert
- get_my_v3_authority_signing_key
- get_my_v3_legacy_cert
- get_my_v3_legacy_signing_key
We should move them along with related fields and support functions, to feature/dirauth.
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