packaging: Allow restore to different db location
packaging: Allow restore to different db location

Change the engine-backup.sh utility to be able to restore a backup so
that the database will have credentials (name/host/password/etc)
different from the ones used when doing the backup.

Bug-Url: https://bugzilla.redhat.com/1002401
Change-Id: Ie2c84111808c638a1c589cf3c14c271184a0a7c2
Signed-off-by: Yedidyah Bar David <e7f2f616ce8817ad893bbeaad3e942e94c69d323@redhat.com>

zerodengxinchao/ovirt-engine,walteryang47/ovirt-engine,yapengsong/ovirt-engine,eayun/ovirt-engine,zerodengxinchao/ovirt-engine,OpenUniversity/ovirt-engine,yapengsong/ovirt-engine,OpenUniversity/ovirt-engine,zerodengxinchao/ovirt-engine,yapengsong/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,yingyun001/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,walteryang47/ovirt-engine,OpenUniversity/ovirt-engine,eayun/ovirt-engine,halober/ovirt-engine,yingyun001/ovirt-engine,zerodengxinchao/ovirt-engine,halober/ovirt-engine,halober/ovirt-engine,walteryang47/ovirt-engine,yingyun001/ovirt-engine,halober/ovirt-engine,yapengsong/ovirt-engine,zerodengxinchao/ovirt-engine,yapengsong/ovirt-engine,OpenUniversity/ovirt-engine,yingyun001/ovirt-engine,yingyun001/ovirt-engine,eayun/ovirt-engine,OpenUniversity/ovirt-engine