packaging: setup: centos: fixed otopi stages order

Fixed otopi loop:
error: method
otopi.plugins.ovirt_engine_setup.olive.core.Plugin._createstorage
is in a later stage than method
otopi.plugins.ovirt_engine_setup.olive.core.Plugin._copyiso
although it depends on it

Fix ordering issue:
Failed to execute stage 'Closing up': 'Plugin' object has no attribute
'_engine_api'

Change-Id: I1be5eb6be1c9c9f78d0273f192c0e6edd3cc46f5
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>