INT-2728 Stored Proc Fix Missing Schema Attribute

INT-2728 - Stored Proc - Add 'return-value-required' attribute

* For Stored Procedure Inbound Channel Adapter: Add 'return-value-required' attribute
* Add tests

For reference: https://jira.springsource.org/browse/INT-2728

INT-2878 Polishing

Add a default false assertion to the parser tests.
Merge pull request #742 from ghillert/INT-2728