opsworks: implement create_stack

moto/opsworks/exceptions.py

@@ -0,0 +1,14 @@
+from __future__ import unicode_literals
+
+import json
+from werkzeug.exceptions import BadRequest
+
+
+class ResourceNotFoundException(BadRequest):
+    def __init__(self, message):
+        super(ResourceNotFoundError, self).__init__()
+        self.description = json.dumps({
+            "message": message,
+            '__type': 'ResourceNotFoundException',
+        })
+