Default to filter_old_env

Author: raphink

lib/puppet/face/catalog/diff.rb

@@ -50,6 +50,7 @@
 
     option '--[no-]filter_old_env' do
       summary "Whether to filter nodes on the old server's environment in PuppetDB"
+      default_to { true }
     end
 
     option '--old_catalog_from_puppetdb' do