Add details about ports on the router information

DHC-1150

In order to show information about the routers public ips in
Horizon, we need to modify the depth param in the get_router
call.

Change-Id: I95c54598117c8817120c53ba57e06810b802b3e1
Signed-off-by: Rosario Di Somma <rosario.disomma@dreamhost.com>