not strictly required, these conversions keep us
up to date with latest rspec conventions and best practices
which will prevent use from having to convert them when they become
deprecated later
This is more like the behavior of the old AuthBrute mixin, where a
scanner module was expected to return :next_user in the block given to
each_user_pass when it successfully authenticated.
The advantage is a reduced number of attempts that are very unlikely to
be successful since we already know the password. However, note that
since we don't compare realms, this will cause a false negative in the
rare case where the same username exists with different realms on the
same service.
MSP-10686
made the one true enumerator of credentials
for the login_scanner.
also covered the wierd http case where it can have a realm key
but no default realm.
David Maloney