Only bind SAIO daemons to localhost

The SAIO configs have no default bind_ip setting configured
which causes them to listen on all available IP addresses.
This can be dangerous on a test machine with public interfaces,
especially with the default passwords set. Its reasonable to
choose a more restrictive setup, especially in SAIO which uses
127.0.0.1 throughout ring-builder, example commands and the
probe tests.

Change-Id: I471c49705ce09e07ec7acc07ee42a1e220529b82