Remove rails-controller-testing from Gemfile

ManageIQ/manageiq-ui-classic should be the only repo that is currently
needing this gem (possibly ManageIQ/manageiq-api), so make those dev
dependencies for those projects directly, and prevent them from being
required by every other project that doesn't need them.

Gemfile

@@ -205,7 +205,6 @@ unless ENV["APPLIANCE"]
     gem "capybara",         "~>2.5.0",  :require => false
     gem "coveralls",                    :require => false
     gem "factory_girl",     "~>4.5.0",  :require => false
-    gem "rails-controller-testing",     :require => false
     gem "sqlite3",                      :require => false
     gem "timecop",          "~>0.7.3",  :require => false
     gem "vcr",              "~>3.0.2",  :require => false

spec/spec_helper.rb

@@ -9,7 +9,6 @@
 require File.expand_path("../../config/environment", __FILE__)
 require 'application_helper'
 
-require 'rails-controller-testing'
 require 'rspec/rails'
 require 'vcr'
 require 'cgi'