Change build context to folder containing dockerfiles

Author: saimidu

docker/deep_learning_container.py renamed to docker/build_artifacts/deep_learning_container.py

@@ -17,7 +17,7 @@
 import pytest
 import requests
 
-from docker import deep_learning_container as deep_learning_container_to_test
+from .docker.build_artifacts import deep_learning_container as deep_learning_container_to_test
 
 
 @pytest.fixture(name='fixture_valid_instance_id')