slice.get_interface(name) uses ssh instead of the FIM (and thus takes a long time)

[nbastin]

On a simple 4-node network, slice.get_interface(name) can take quite a bit of time (8 seconds on my current topology). I haven't chased down exactly why, but it uses ssh to go to each node as part of this process. However, you can do the same thing yourself without ssh:

node_intf_map = {}
for node in slice_object.get_nodes():
  for intf in node.get_interfaces():
    node_intf_map[intf.get_name()] = intf

which takes milliseconds, and then can be used to perform the same lookup as slice.get_interface(name).