Do not use self.name for volume name field
Do not use self.name for volume name field

Since volume v1 is deprecated, 'display_name' is no
longer needed for volume name field, so this is to
put 'name' directly instead of using self.name

Change-Id: Ia6245c56a4b2d56a207a5052f1d68221637f4c16

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