juju-core on i386

[David Cheney]

> Do we have 32-bit binaries for Mongo as well? The other limiter is
> that the client defaults the target to the same architecture, and at
> least until now you couldn't run a 32-bit state server.

Mongo is not needed on the client. We do have mongodb-server binaries
for 386 state servers. However, all state servers are hard coded to use
a amd64 image (I just checked, William says this is true)