S3 - Add IllegalLocationConstraint validation when creating buckets

moto/s3/exceptions.py

@@ -127,6 +127,18 @@ class InvalidRequest(S3ClientError):
         )
 
 
+class IllegalLocationConstraintException(S3ClientError):
+    code = 400
+
+    def __init__(self, *args, **kwargs):
+        super(IllegalLocationConstraintException, self).__init__(
+            "IllegalLocationConstraintException",
+            "The unspecified location constraint is incompatible for the region specific endpoint this request was sent to.",
+            *args,
+            **kwargs
+        )
+
+
 class MalformedXML(S3ClientError):
     code = 400