Good error message for providing unwanted parameters

[bittrance]

The current strategy risks providing unwanted parameters, which annoys the aws-sdk. We should handle this case properly and provide a good error message (and no traceback).

Error:
Parameter values specified for a template which does not require them.
/Users/quest/projects/personal/cuffsert/vendor/bundle/ruby/2.0.0/gems/aws-sdk-core-2.6.42/lib/seahorse/client/plugins/raise_response_errors.rb:15:in `call'
	/Users/quest/projects/personal/cuffsert/vendor/bundle/ruby/2.0.0/gems/aws-sdk-core-2.6.42/lib/aws-sdk-core/plugins/idempotency_token.rb:18:in `call'
	/Users/quest/projects/personal/cuffsert/vendor/bundle/ruby/2.0.0/gems/aws-sdk-core-2.6.42/lib/aws-sdk-core/plugins/param_converter.rb:20:in `call'
	/Users/quest/projects/personal/cuffsert/vendor/bundle/ruby/2.0.0/gems/aws-sdk-core-2.6.42/lib/seahorse/client/plugins/response_target.rb:21:in `call'
	/Users/quest/projects/personal/cuffsert/vendor/bundle/ruby/2.0.0/gems/aws-sdk-core-2.6.42/lib/seahorse/client/request.rb:70:in `send_request'
	/Users/quest/projects/personal/cuffsert/vendor/bundle/ruby/2.0.0/gems/aws-sdk-core-2.6.42/lib/seahorse/client/base.rb:207:in `block (2 levels) in define_operation_methods'
	/Users/quest/projects/personal/cuffsert/lib/cuffsert/rxcfclient.rb:27:in `block in create_stack'