Update GraphKeys.VARIABLES to GraphKeys.GLOBAL_VARIABLES.
Update GraphKeys.VARIABLES to GraphKeys.GLOBAL_VARIABLES.

bousmalis/models,cshallue/models,jazcollins/models,cshallue/models,sshleifer/object_detection_kitti,tombstone/models,hang-qi/models,hang-qi/models,r888888888/models,alexgorban/models,alexgorban/models,hang-qi/models,cshallue/models,r888888888/models,bousmalis/models,bousmalis/models,alexgorban/models,tombstone/models,tombstone/models,jiaphuan/models,wangyang59/tf_models,jch1/models,xcyan/models,r888888888/models,cshallue/models,derekjchow/models,jiaphuan/models,wangyang59/tf_models,wangyang59/tf_models,bousmalis/models,jch1/models,wangyang59/tf_models,beomyeol/models,alexgorban/models,xcyan/models,derekjchow/models,alexgorban/models,hang-qi/models,sshleifer/object_detection_kitti,beomyeol/models,xcyan/models,derekjchow/models,tombstone/models,hang-qi/models,derekjchow/models,jazcollins/models,r888888888/models,jazcollins/models,jazcollins/models,jazcollins/models,jch1/models,sshleifer/object_detection_kitti,wangyang59/tf_models,beomyeol/models,hang-qi/models,xcyan/models,jch1/models,cshallue/models,jazcollins/models,jch1/models,jiaphuan/models,tombstone/models,xcyan/models,bousmalis/models,zbigniewwojna/text-rcnn,derekjchow/models,jiaphuan/models,jiaphuan/models,tombstone/models,sshleifer/object_detection_kitti,jiaphuan/models,r888888888/models,sshleifer/object_detection_kitti,wangyang59/tf_models,jch1/models,sshleifer/object_detection_kitti,r888888888/models,bousmalis/models,xcyan/models