Modify identity_crisis to not take a message.

  The message will always be the same

Modify unittest::v1::identity to have the internal assert_is_not
function be private

  The templated functions handle the 'address getting', though one or
  two more functions may be necessary.

Add several identity unit tests

  These are to help work towards #2. As I implement each assertion
  error, I will be adding a test for each one.