Correct the usage of decorator.decorator
Correct the usage of decorator.decorator

Correct the usage of decorator.decorator as described in [1].

[1]http://pythonhosted.org/decorator/documentation.html#decorator-decorator

Change-Id: Ia71b751f364e09541faecf6a43f252e0b856558e
Closes-Bug: #1483464

eshijia/SUR,mjbrewer/testindex,ddepaoli3/magnum,mjbrewer/testindex,dimtruck/magnum,eshijia/magnum,eshijia/magnum,dimtruck/magnum,ramielrowe/magnum,openstack/magnum,ffantast/magnum,ramielrowe/magnum,annegentle/magnum,Tennyson53/magnum,jay-lau/magnum,Tennyson53/SUR,Alzon/SUR,ffantast/magnum,openstack/magnum,Alzon/SUR,annegentle/magnum,eshijia/SUR,Tennyson53/magnum,ArchiFleKs/magnum,ddepaoli3/magnum,Tennyson53/SUR,ArchiFleKs/magnum,mjbrewer/testindex