sandbox: Add ports to br-int in ovn-setup.

sandbox: Add ports to br-int in ovn-setup.

ovs-sandbox comes with a script to quickly set up a simple
OVN configuration, ovn-setup.sh.  This script set up config in the OVN
northbound database, but didn't create the corresponding ports on
br-int.  Add that to save another step in provisioning this simple
environment.

Add "ovn-sbctl show" output as well, to follow the existing "ovn-nbctl
show" output.

Signed-off-by: Russell Bryant <russell@ovn.org>
Acked-by: Ben Pfaff <blp@ovn.org>