To provide the ability to control task orchestration via the exit
message, we moved the stack trace storage to a new field. This means
that exit message is now a field we can use similar to how exit code is
in batch, and still have the stack trace of an unsuccessful task
execution stored.
Resolvesspring-cloud/spring-cloud-task#186
Disabled integration tests by default
Just some cleanup on merge
db0565b7cf