[5.5] Fix eager loading HasManyThrough relations with custom intermediate and local key#21902

taylorotwell merged 2 commits intolaravel:5.5laravel/framework:5.5from

druc:fix_eager_loading_relation_with_custom_intermediate_and_local_keydruc/framework:fix_eager_loading_relation_with_custom_intermediate_and_local_keyCopy head branch name to clipboard