Remove extra Java job type fields from JobExecutions

Remove main_class and java_opts from the JobExecutions table.
Those values will be passed as 'edp.' configs instead.

Partial-implements: edp-config-parameter-prefix
Change-Id: I352d74a281653edd87d2c61b0975a23eebf08197
Merge "Remove extra Java job type fields from JobExecutions"