Port test suite from nose to pytest.

This just eliminates all errors on the tests collection. Elimination of
failures is left to the next commit.

tests/test_batch/__init__.py

@@ -0,0 +1 @@
+# This file is intentionally left blank.

tests/test_batch/test_batch.py

@@ -7,10 +7,6 @@ from botocore.exceptions import ClientError
 import sure  # noqa
 from moto import mock_batch, mock_iam, mock_ec2, mock_ecs, mock_logs
 
-import functools
-import nose
-
-
 DEFAULT_REGION = "eu-central-1"
 
 

tests/test_batch/test_batch_cloudformation.py

@@ -14,7 +14,6 @@ from moto import (
     mock_cloudformation,
 )
 import functools
-import nose
 import json
 
 DEFAULT_REGION = "eu-central-1"