Properly test for interdependence between hashed/salt/email-related properties

[toolness]

Currently, the validator doesn't do a great job of testing the interdependence between recipient and salt in 0.5 assertions, or recipient.identity, recipient.hashed, and recipient.salt in 1.0 assertions. It's even mentioned in a TODO in the test suite.

We should fix this, as we want OBI tools to be able to safely assume a validated badge is actually valid.

[threeqube]

We should fix this, as we want OBI tools to be able to safely assume a validated badge is actually valid.

THIS. 👍