Fix QA test subject address by configuring capybara

qa/qa/scenario/entrypoint.rb

@@ -8,6 +8,7 @@ module QA
       include Bootable
 
       def perform(address, *files)
+        Specs::Config.act { configure_capybara! }
         Runtime::Scenario.define(:gitlab_address, address)
 
         ##

qa/qa/specs/config.rb

@@ -9,6 +9,8 @@ require 'selenium-webdriver'
 module QA
   module Specs
     class Config < Scenario::Template
+      include Scenario::Actable
+
       def perform
         configure_rspec!
         configure_capybara!