Use testr directly from tox
Use testr directly from tox

Change-Id: I0da3538ff11639982ebc082a1834968e3d6a71d3
Signed-off-by: Zhi Yan Liu <98cb9f7b35c45309ab1e4c4eac6ba314b641cf7a@cn.ibm.com>
openstack/glance_store,redhat-openstack/glance_store,saeki-masaki/glance_store,jamielennox/glance_store,jamielennox/glance_store,redhat-openstack/glance_store,hmakkapati/glance_store,saeki-masaki/glance_store,openstack/glance_store,hmakkapati/glance_store,cpallares/glance_store,cpallares/glance_store