Remove unneeded files from the railties test directory

railties/test/initializer/root/config/database.yml

-development:
-  adapter: sqlite3
-  database: db/railties.db
-  timeout: 5000
\ No newline at end of file

railties/test/initializer/test_helper.rb

-# This is a test helper file that simulates a rails application being
-# boot from scratch in vendored mode. This file should really only be
-# required in test cases that use the isolation helper so that requires
-# can be reset correctly.
-RAILS_ROOT = "#{File.dirname(__FILE__)}/root"
-RAILS_FRAMEWORK_ROOT = File.expand_path("#{File.dirname(__FILE__)}/../../..")
-
-require 'rubygems'
-gem 'rack', '~> 1.0.0'
-
-require "test/unit"
-# We are purposely avoiding adding things to the load path to catch bugs that only happen in the genuine article
-require "#{RAILS_FRAMEWORK_ROOT}/activesupport/lib/active_support/testing/isolation"
-require "#{RAILS_FRAMEWORK_ROOT}/activesupport/lib/active_support/testing/declarative"
-
-class Test::Unit::TestCase
-  extend ActiveSupport::Testing::Declarative
-
-  def assert_stderr(match)
-    $stderr = StringIO.new
-    yield
-    $stderr.rewind
-    err = $stderr.read
-    assert_match match, err
-  ensure
-    $stderr = STDERR
-  end
-end
-
-# Fake boot.rb
-module Rails
-  class << self
-    attr_accessor :vendor_rails
-
-    def vendor_rails?
-      @vendor_rails
-    end
-
-    def boot!
-      # Require the initializer
-      $:.unshift "#{RAILS_FRAMEWORK_ROOT}/railties/lib"
-      require "rails/initializer"
-      # Run the initializer the same way boot.rb does it
-      Rails::Initializer.run(:install_gem_spec_stubs)
-      Rails::GemDependency.add_frozen_gem_path
-      Rails::Initializer.run(:set_load_path)
-    end
-  end
-end
-
-# All that for this:
-Rails.boot!