The refactored interface is now in use. The only module that used it
directly was the CDC protocol module. This should probably be changed so
that it uses the adminusers interface instead of the users interface
directly.
The /users/ resource shows all user accounts that can be used with
MaxScale. This resource is further split into two resource collections,
/users/inet and /users/unix, which contain the network users and Linux
accounts respectively.
The admin interface now supports Basic Access authentication. This is not
a secure method of authentication and it should not be used without
unencrypted connections.
Made the admin interface port, authentication, username and password
configurable.
