Re-assigning interfaces doesn't reconfigure them
Re-assigning interfaces does not reconfigure their IP assignments. Example: if you have OPT1 assigned to em2 and OPT2 to em3, and swap those in Interfaces -> Assign to OPT1 to em3 and OPT2 to em2, the IP configuration is not updated on either interface, they both retain their previous IP assignments.
Resolves #174. If the interface reassignment changes reload the config for the interface.