Revert "core: remove scheduler from ejb jars"

This reverts commit f1224113b069f9de19d19e357287aafe22edcafc.

Change-Id: I7735fa78dd9d76d9f5ef47f28ec65d29884d87bf
Signed-off-by: Yair Zaslavsky <yzaslavs@redhat.com>