Sign out before redirecting to login page

* We expect to be on the login page when redirect_to_login_page is
  called. If we are logged in, we get redirected, and the call to visit
  fails looking for page elements

Changelog: fixed

qa/qa/page/main/login.rb

@@ -157,6 +157,7 @@ module QA
         end
 
         def redirect_to_login_page(address)
+          Menu.perform(&:sign_out_if_signed_in)
           desired_host = URI(Runtime::Scenario.send("#{address}_address")).host
           Runtime::Browser.visit(address, Page::Main::Login) if desired_host != current_host
         end