core:running the db scripts manually with user...

running the db scripts manually with user posgres will change the table permission and upgrade will fail since user engine cannot change tables

Setting user "engine" as the deault user for all the following
utilities:

backup.sh
create_db.sh
create_db_devel.sh
create_schema.sh
encryptionvalidator.sh
encodingvalidator.sh
exportDbSchema.sh
fkvalidator.sh
refreshStoredProcedures.sh
restore.sh
taskcleaner.sh
unlock_entity.sh
upgrade.sh

Change-Id: I8ae8999dcfad53a1e62613dbff915f76b32e89de
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=958765
Signed-off-by: Eli Mesika <emesika@redhat.com>