Add operation policy name to demo scripts

This change adds the ability to set the operation policy name
attribute to object creation demo scripts, including demos for
the Create, CreateKeyPair, and Register operations.

kmip/demos/pie/register_symmetric_key.py

@@ -41,6 +41,7 @@ if __name__ == '__main__':
     name = 'Demo Symmetric Key'
 
     key = objects.SymmetricKey(algorithm, length, value, usage_mask, name)
+    key.operation_policy_name = opts.operation_policy_name
 
     # Build the client and connect to the server
     with client.ProxyKmipClient(config=config) as client: