Switch logic for linting factories

Only if you set the environment variable OSEM_FACTORY_LINT
to 'false' it won't lint.

spec/support/factory_girl.rb

@@ -3,7 +3,7 @@ require_relative 'external_request'
 RSpec.configure do |config|
 
   config.before(:suite) do
-    if CONFIG['factory_girl_lint']
+    if ENV['OSEM_FACTORY_LINT'] != 'false'
       mock_commercial_request
       FactoryGirl.lint
     end