Make parallel tests configurable

- Default maxParallelForks to 1 if not provided as a property.
  - To override, -PmaxParallelForks=<?>
- Fix jdbc_tests to add sleep in between creation/deployment of job and tap on job execution listener output
Update refs to spring.io
XD-1444: Update to boot 1.0 release
XD-1449 Upgrade Spring Shell to 1.1 RC1