Merge "Use last address in v6 allocation pool generation"

diff --cc neutron/db/db_base_plugin_v2.py
Simple merge

diff --cc neutron/db/ipam_backend_mixin.py
Simple merge

diff --cc neutron/tests/unit/db/test_db_base_plugin_v2.py
Simple merge

diff --cc neutron/tests/unit/ipam/test_subnet_alloc.py
Simple merge