core:  Installation fails with message of...

core:  Installation fails with message of "Failed to execute stage
'Misc configuration': Command
'/usr/share/ovirt-engine/dbscripts/create_schema.sh' failed to execute"

In case that clean install is performed on a database that already has
the old uuid implementation , we should remove the old uuid
implementation before attempting to create the new uuid implementation

Change-Id: I4a2d406ff71f312805c8e55c1fe58886c591e1f6
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=997370
Signed-off-by: Eli Mesika <emesika@redhat.com>