SAIO updates to support EC development environment.

Added one more device per server but only include them
on the EC ring as probetests won't work with anything
other than 4 devices on the ring.

See comment in swift.conf for EC development use.

Change-Id: I9754554886be440ef53b7ffce4709b6f117d9280
Merge "SAIO updates to support EC development environment." into feature/ec