Ditch extra key settings

[c0c0n3]

We should get rid of the following params in the adapter config:

• idsa_public_key
• idsa_private_key

In fact, idsa_public_key is the pub key the adapter uses to validate tokens in incoming requests from another IDS connector whereas idsa_private_key is the corresponding private key. Since we expect incoming requests will contain an ID token the client connector got from the same DAPS server we use to get out ID token, then:

idsa_public_key = daps.server_certificate

[c0c0n3]

Probably best to tackle this issue alongside #21.