Fixes #11089 - Adapt tests to Rails 4

This commit contains all changes to tests in branch
https://github.com/theforeman/foreman/pull/2055 that I found to be
retrocompatible with Rails 3. The more of these we can get in, the less
code we will have to review for Rails 4, and the more relevant it will...

fixes #10627 - apply host taxonomy scope to facts/report joins

Previous changes to perform a join onto hosts with authorisation result
in a query such as Report.joins(:hosts), which ignores any
default_scope on Host::Base. This commit explicitly passes taxonomy...

fixes #8817 - look up reports with all joins from host scoped_search

This changes the optimisation in d50c799 which caused errors for users with
host filters referencing tables other than hosts.

When retrieving all reports joined with authorised hosts, the nested joins need...

fixes #5909 - return r/w resources from authorized scope

Refs #3809 - Remove useless assignments

fixes #3272 - allow 'admin' account to be removed and replaced

Fixes #5391 - Authorizer test should use testing permission

Also change order of seed so admin user can be saved and
existing Anonymous role is assigned.

fixes #812 - new permissions model, user group role and nest support, role filters for better granularity

• Daniel Lobato <elobatocs@gmail.com>
• Joseph Magen <jmagen@redhat.com>
• Tom McKay <thomasmckay@redhat.com>
• Greg Sutcliffe <gsutclif@redhat.com>...