packaging: services: ovirt-engine: dump memory on OutOfMemoryError is now default

Change the default param of JBoss so that if the engine crash on OutOfMemory,
a dump file will be created, under the LOG/dump directory.

Change-Id: Ia2690bd371847561717a38410b4431f5e0edb185
Signed-off-by: lzelkha@redhat.com <liran.zelkha@gmail.com>
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>