The type of the created user can now be specified with the --type option.
Expanded tests that cover the user creation. Also added a test case that
checks that basic users are only allowed to read through the REST API.
As the REST API is a part of the core, it is more appropriate for the
tests to reside there as well. Further refactoring of the testing needs to
be done to allow multiple components to use the same framework but with
different tests.
The /maxscale/ resource now supports PUT requests which modify core
parameters. As not all parameters can be changed at runtime, only
modifications to parameters that support runtime configuration are
allowed.
