In keystone V3 client, the tenants attribute is replaced by projects. Change the driver's usage to use this new attribute and be compatiable with the V2 keystone at the same time. Change-Id: Idf5c76d6dcdf866047b6b4ceb803149f6fbcfd8c
In keystone V3 client, the tenants attribute is replaced by projects. Change the driver's usage to use this new attribute and be compatiable with the V2 keystone at the same time. Change-Id: Idf5c76d6dcdf866047b6b4ceb803149f6fbcfd8c