https://issues.apache.org/jira/browse/AMQ-5381

Apply fix and test for error when restoring old content and treating it
as compressed when it was not.
https://issues.apache.org/jira/browse/AMQ-5389
https://issues.apache.org/jira/browse/AMQ-5387

Fixes some issues around processing of back to back frames and reading
of null blocks between messages.