Use unix socket if hosts matches up
Use unix socket if hosts matches up

If the hosts are the same according to the instance
and the opernstack database use the UNIX socket.

Signed-off-by: Chuck Short <753a8074f04ffd62a8fff7516e3ae689be8e35ad@canonical.com>

tpouyer/nova-lxd,tpouyer/nova-lxd