fixing jenkins runcible module issue

should fix odd jekins issue during dbmigrate:


uninitialized constant Katello::ThreadSession::UserModel::Runcible
/usr/share/katello/lib/util/threadsession.rb:56:in `set_pulp_config'
/usr/share/katello/lib/util/threadsession.rb:48:in `current='
/usr/share/katello/db/migrate/20120702175532_add_repository_library_id.rb:9:in `up_without_benchmarks'
/usr/lib/ruby/gems/1.8/gems/activerecord-3.0.10/lib/active_record/migration.rb:314:in `send'