feat(ProcDef): first cut of upgrate scripts (SQL)

related to #CAM-1467
feat(JobDef): make sure jobdefinition is created

- this is necessary if database upgrade is performed

related to #CAM-1467
Merge branch 'job-suspension' of github.com:camunda/camunda-bpm-platform into job-suspension
test(JobDef): migration tests for JobDef

related to #CAM-1467
Merge branch 'job-suspension' of github.com:camunda/camunda-bpm-platform into job-suspension