Fix delete_custom_resource import (#222)

Issue #, if available:

Description of changes:
Previous import did not work when run in same-level 

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Author: ryansteakley

test/e2e/__init__.py

@@ -23,7 +23,7 @@
 import random
 
 from acktest.k8s import resource as k8s
-from common import config as cfg
+from e2e.common import config as cfg
 
 
 SERVICE_NAME = "sagemaker"