Use common func create_volume in test_volumes_actions
Use common func create_volume in test_volumes_actions

The multi lines to create test volume can be replaced by one
call to base.create_volume to keep code clean.
Besides, _reset_volume_status's return value is never used and
so can be removed.

Change-Id: I526f8940c4f29a93f25f896bc4779a771f4c3eb5

sebrandon1/tempest,cisco-openstack/tempest,Tesora/tesora-tempest,sebrandon1/tempest,Juniper/tempest,vedujoshi/tempest,masayukig/tempest,Tesora/tesora-tempest,masayukig/tempest,openstack/tempest,vedujoshi/tempest,Juniper/tempest,openstack/tempest,cisco-openstack/tempest