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
INT-2899: Remove Redundant Logic from Aggregator

Previously, `AggregatingMessageHandler#setExpireGroupsUponCompletion` had additional logic
for removing complete MessageGroups. It could produce some overhead on application start-up with big persistent `MessageStore`.
This logic played a role to remove empty groups from a `MessageStore`.
Since `AbstractCorrelatingMessageHandler#forceComplete` has an ability to to remove empty groups too,
this logic became redundant.
So, to clean `MessageStore` from empty complete groups, it's sufficient to use a `MessageGroupStoreReaper`.

* Remove logic iterating over the `MessageStore` from `AggregatingMessageHandler#setExpireGroupsUponCompletion`
* Polishing `AggregatorSupportedUseCasesTests.java` to use `store.expireMessageGroups(0)`
* Introduce `empty-group-min-timeout` xml-attribute, populating `AbstractCorrelatingMessageHandler#minimumTimeoutForEmptyGroups`
* Add parser tests for `empty-group-min-timeout` attribute

JIRA: https://jira.springsource.org/browse/INT-2899

INT-2899: Documentation about changes of ACMH

* rename new XSD-attribute to `empty-group-min-timeout`
* add to Reference Manual description about `empty-group-min-timeout`
* add 'What's new' for `empty-group-min-timeout`
* add 2.2-3.0 Migration Guide note

INT-2899 Doc Polishing
Merge pull request #727 from artembilan/INT-2899
INT-2912 JdbcMessageStore Add 'region' to Queries

Missing region column in some queries.

For reference see: https://jira.springsource.org/browse/INT-2912

INT-2912 - Code Review
* Eliminate Spring Application Context for Test
* Improve SQL Query

INT-2912 Polishing

Modified testVerifyMessageGroupCount to test size of each
group in each region.
Merge pull request #729 from ghillert/INT-2912