message: Report mismatched certificates in `transition_service_to_open` proposal.
diff: @@ -1524,10 +1524,12 @@ namespace ccf
  if (identities.next != service_info->cert)
  {
  - throw std::logic_error(
  + throw std::logic_error(fmt::format(
  "Service identity mismatch: the next service identity in the "
  "transition_service_to_open proposal does not match the current "
  - "service identity");
  + "service identity:\nNext:\n{}\nCurrent:\n{}",
  + identities.next.str(),
  + service_info->cert.str()));
  }
  service_info->previous_service_identity_version =
  