tests: fix authentication in controller tests.

Fix controller tests to login for real instead of faking it.

app/logical/session_loader.rb

@@ -14,9 +14,7 @@ class SessionLoader
     CurrentUser.user = User.anonymous
     CurrentUser.ip_addr = request.remote_ip
 
-    if Rails.env.test? && Thread.current[:test_user_id]
-      load_for_test(Thread.current[:test_user_id])
-    elsif session[:user_id]
+    if session[:user_id]
       load_session_user
     elsif cookie_password_hash_valid?
       load_cookie_user
@@ -34,11 +32,6 @@ class SessionLoader
 
 private
 
-  def load_for_test(user_id)
-    CurrentUser.user = User.find(user_id)
-    CurrentUser.ip_addr = "127.0.0.1"
-  end
-  
   def set_statement_timeout
     timeout = CurrentUser.user.statement_timeout
     ActiveRecord::Base.connection.execute("set statement_timeout = #{timeout}")