net: add ifnet_rename_event EVENTHANDLER(9) for interface renaming

and don't trigger ifnet_arrival_event and ifnet_departure_event for a
rename, as the interface isn't being detached from any protocol.  The
consumers of the arrival/departure events are divided into a few
categories:
- which indeed need to do the same actions as if interface was fully
  detached and attached: routing socket and netlink notifications to
  userland and the Linux sysfs.  All addressed by this commit.
- which build their logic based on an interface name, but should actually
  update their database on rename: packet filters.  This commit leaves
  them with the old behavior - emulate full detach & attach, but this
  should be improved.
- which shouldn't do anything on rename, not touched by the commit.
- ng_ether and if_tuntap, that are special and will be addressed by
  separate commits.

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