Use addClassResourceCleanup in TagsExtTest
Use addClassResourceCleanup in TagsExtTest

This is to use addClassResourceCleanup in TagsExtTest,
so resource_cleanup can be removed.

Change-Id: I7d651bc00fa6eb5f6277091563e69219be798b27

masayukig/tempest,Juniper/tempest,cisco-openstack/tempest,openstack/tempest,cisco-openstack/tempest,Juniper/tempest,openstack/tempest,masayukig/tempest