JIRA: https://jira.spring.io/browse/INT-4202
The `StoredProcOutboundGateway` uses `MessageBuilder` directly for procedure result without any conditions.
If procedure result is `null`, `MessageBuilder.withPayload` throws `java.lang.IllegalArgumentException: payload must not be null`.
* Since the super `AbstractReplyProducingMessageHandler` class takes care about `null` reply properly via its `requiresReply` property and really uses `MessageBuilder`
for reply, just fix `StoredProcOutboundGateway` to return procedure result as is from the `handleRequestMessage()` implementation
* Fix some typos and code style
* Increase some JDBC tests performance changing `Thread.sleep()` solution to proper `PollableChannel.receive()` or iterations over expected result
**Cherry-pick to 4.3.x**
Update `@Copyright` to 2017
Make `StoredProcOutboundGateway` as `requiresReply = true` by default
Revert `setRequiresReply(true)` change
Specify `setRequiresReply(true)` only if `expectSingleResult == true` and `setRequiresReply()` hasn't been called explicitly
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