JIRA: https://jira.spring.io/browse/INT-3657
With XML/DSL, the MMPP defaults to 1 (via the SPCAFB) but
@InboundChannelAdapter defaulted to -1 (infinity).
Change the annotation to be consistent with the XML/DSL.
Add missing schema docs for the `basePollerType`.
* Fix `AbstractMethodAnnotationPostProcessor` for `maxMessagesPerPollValue` override
* Change `EnableIntegrationTests#foo()` `@InboundChannelAdapter` to use `maxMessagesPerPoll = "2"`
and modify appropriate test-case to be sure that `maxMessagesPerPoll` isn't overriden as it has been done in the original commit.
29e65e68af